E46 catless headers pros and cons. May 2, 2014 · Headers with cats is an oxymoron as it is. The second option is likely much cheaper and im not sure the first one gives any performance advantage, or does it? That is essentially my question to you, oh wise ones. And depending on where you are it won't pass inspections. I ended up getting it tuned for o2 and sap delete along with a stage 2 from a local bmw tuning shop. Dec 4, 2015 · 6891 posts · Joined 2009. The main purpose of the 2 post cat Lamda sensors is to check and make sure that the cats are there and functioning, but the DME also uses the readings from all 4 Lamdas to adjust the A/F trims and timing for the motor. You can see it when the turbo spools. #10 · Nov 15, 2011. E46 Fanatics Forum is not in any way affiliated with Bayerische Motoren Werks AG VerticalScope Inc. iTrader: ( 9) Garage List. Before install the car ran mint like brand new off the lot, after the catless header install the car became no more then a show car. SPELAB Stainless Steel Sport Exhaust Headers for BMW 320i/325i/330i E46; Z3 E36/7; E60/E61 520i/525i/530i; E65/E66 730i; E85 Z4; E83 X3; E53 X5 with M54 6-cylinder engine, and manual or automatic transmissions. Jan 24, 2019 · Hello all, So I've bought E39 (catless) stock headers for cheap and would like to heat wrap/port/install them instead of the ones that come stock on E46's, to gain something like 10-15 hp, but also because I'm highly suspecting that at least one of my cats is shot ("echo" sound coming from where they sit, pops and crackles on throttle release and last but not least: I recently found out that a Dec 22, 2015 · You've changed out lots of suspension components. This results in higher power output and less turbo-lag with given engine specification. With that said, the actual fitment was just fine, though. Going catless over the stock downpipes can yield gains of 25+ horsepower. Best overall is Supersprint and Im still not sure if they have been released yet, but I want to say EPIC headers are right there with Supersprint. Aug 21, 2008 · Pros-. Regarding downpipes, there are two main options: catless and catted downpipes. Features: - 6-2 primary tubing. Brand: Active Autowerke. S. Even if it doesn’t start unraveling. 5Ft lb. $ 759. Dec 6, 2020 · Catless downpipe is definitely not worth it. A cat back exhaust doesn't help with HP as much because you're still running the original pipes from the engine to the cat. Mar 24, 2016 · Swap the E46’s factory header with integrated cats, known to be highly restrictive, for a BMW E46 performance header that is much more free-flowing. It even started chirping going into third, so there is that. Primary length and diameter, collector length and diameter. Sounds louder and deeper than catted DP. for the performance figures you gain (bang for buck) Cons: -Illegal if Catless (at least Apr 24, 2017 · F. Hopefully very durable and warranteed. diverse Discussion starter. Performance benefits include 15-20+ wheel horsepower gains, along with quicker spool, better top-end power, and awesome sounds. A downpipe is an important component of a vehicle’s exhaust system, funneling exhaust gases from the turbocharger into the rest of the exhaust system. Exhaust ports are the same as a 330 . Works for an MS43 DME but there is no EU2 option for the newer MS45's. Headers & a Magnaflow 16533 Cat-Back make for a very nice working combo, you can occasionally buy the 16533 on Amazon for about $829 shipped. Apr 22, 2015 · SOLD: 2016 Mustang GT. The OEM ones are too restrictive and change the overall tone of the exhaust. This is also louder than a straight piped E9x m3. Mar 5, 2020 · Pros and Cons of Headers Over Manifolds: Pros: The smooth walls of the header piping is better for flow than the rough walled castings of the headers. Get more out of your 2000-2006 BMW M3 with this 6-2 Stainless Steel Header. #5 · Nov 9, 2012 (Edited) First, the CDV: The Clutch Delay Valve is intended to slow down clutch engagement in order to minimize powertrain stress. Features: Oct 26, 2015 · For me the choice was mostly cosmetic to go with the catless headers. Jul 3, 2021 · And the test loop is tantamount to a OBD drive cycle. Going to a straight pipe will through a CE light if you don't May 15, 2008 · PROS: rear wheel drive!, near 50/50 weight distribution, tons of moding options, great performance and good looks CONS: LCAs and CABs need replacement after around 50-60K miles, cooling system overhall at about 75K miles are pretty much mandatory. Let's be realistic and not romaticize. Aug 31, 2013 · My sister just got a CLK 430 and got the muffler chopped off and it's pretty quiet compared to the S54 engine. I have a '19, 6. Location: SoCal. Sep 2, 2014 · Shortly after 2 PM the European headers were installed and the remainder of the exhaust remained as it came from the factory. models (not XI) Please note: The system has no E-mark or TÜV approval and is therefore not May 11, 2008 · 12. Schmiedmann high flow Sport manifold M52/M54 inclusive 300cell Euro3D4 metal sport catalysts (pipes from the catalyst to the rear silencer is not included) 705. Jul 28, 2017 · We may earn a commission for products purchased through links on this page BMW E46 M3 Header by BMW tuner, Active Autowerke. Description. Catless downpipes are an off road only modification and should not be used on the street. 2000 BMW M5 [0. Simple bolt-ons for the N54 can push the engine to 400-450+whp with relative ease. Benefits: May 28, 2021 · Thank you very much for the feedback on M3 headers. I decided to get the mid muffler delete and with a cold start I think it sounds really throaty, like the difference between if you had a slight cough or had pneumonia. Apparently "JVT, M3ANONE, Dixis, Evosport, Friedrich, Kromer Kraft, & Race Marquee" are discontinued or unavailable so I'm going to ignore those from now on. Buttoned up and strapped back on the dyno it put down 310 horsepower and 254 torque. Direct bolt-on, increased exhaust flow for improved engine performance. Nov 20, 2007 · ok guys wanna know what you all think about ebay headers the pros and cons please any feedback is appreciated. It was suttle, loud but not too loud and sounded clean. Next, I would put all the other headers in a class Pros: -Pretty Substantial increase in Power (especially/mostly when combined with a Tune) -Sounds Good / Slightly better exhaust note / louder turbo spool noise (the majority of drivers would approve and not find annoying) -CAN be a fairly cheap mod. yjsaabman. All 6cyl. Catless will smell strong like unburnt fuel, especially when it's cold (at least in my experience). Their output is a function of exhaust gas heat, not pressure like most people Feb 14, 2021 · MS45 equipped facelift or ZHP BMW E46, BMW E39, BMW E60, BMW Z4, BMW X5, BMW X3 with M54 Engines! We are proud to have truly mastered the MS45. , 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada Jan 10, 2013 · Shipping Speed: 10/10. The flow slows down when the gas cools off. Has anyone did the setup above with no cats and then tried with cats - was there a difference in torque?? I have a full catback exhaust (highline) and the ebay headers. ~SGT catless headers|Full BW 3. Pros: Effective, legitimate, name-brand solution. May 3, 2012 · 953 posts · Joined 2011. Sticking to naturally aspirated power increases, if the motor has good compression, swapping for a catless header and a good 93 octane tune should increase peak power to roughly 320 WHP. Also other mods. Content on E46 Fanatics Forum is generated by its users. E46 M3 final word on ebay headers The cat is usually located fairly close to the engine. Power I'd say if you are going from stock cats to no cats you'll gain power, if you are going from high flows to no cats there is a chance you might gain something but I wouldn't expect to gain anything. If that happens, you will get a rude awakening from the engine – and it won’t be pretty. Coatings help keep the exhaust gasses hot. 10/10. Oct 11, 2007 · Originally Posted by lemans 07. 6402 posts · Joined 2013. It is also an engineer's approach to preventing burnouts. , 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada Jan 30, 2017 · so as the title suggest, I'm trying to weigh the pros and cons of buying a new catless header system (likely arrow) versus simply having a new mid pipe/cat delete section added. ago. SKU SCM5254. Factory E46 M3’s put down about 280 WHP. These M54 exhaust manifolds are one of the Biggest performance killers on the M54 motors. These pipes are TIG-welded as well and won’t require any tuning. 00] 2008 BMW M3 [7. I like to drive with my windows down which is why I’m hesitant on actually going catless. And that's not even counting spot check if your county has them. • 8 yr. I have seen guys on jetboats do it and the weight of the collector caused the headers to warp and actually drop a couple inches. The tune will take care of the CEL for about 50 bucks and you wont have restrictive headers. Hello everyone, I want to get catless and a tune for my e46 but I’ve heard and read that when you remove the cats on an e46 the exhaust smell is really bad and unbearable. Only the real flash tunes like Eurodyne, UM, APR, Unitronic, GIAC, DM etc. #7. May 6, 2013 · Like. The DCE Parts Catless Race Header is a lightweight header design, channeling the exhaust gasses into a 3-to-1 collector design. 5" Resonated Race Exhaust w/ diffuser | Epic Motorsports Race Tune | BAC Filter | BW Intake Elbow. Input correct Fuel-Air mixture Your still likely to get CELs with catted vs catless as well as the possibility at not passing CARB-like sniff tests. This is done to remove exhaust restrictions – allowing exhaust gases to flow faster and spool the turbo even harder. Apr 14, 2018 · This is something that is often a reason that Back End Flash was created to sit behind the JB4. not throw CEL's B. Some people even believe you could possibly lose power. For M52TU, you will either need a M54 mid-section or you will need to modify the flanges of the M52TU mid-sections. "The secret to the Shark Injector Race software is that it 'turns down' the readings from the rear O2 sensors to eliminate codes for 'cat-inefficiency'. Most racers are changing out parts of their car a lot anyway, so the extra moisture won’t cause an issue. View. Question 1) Can I delete my secondary air pump without having it coded out or will this affect the drive-ability? Jun 21, 2022 · Catless headers help. No drone, no rasp, just the sound of the engine beefed up a bit. 06 USD excl. Nov 9, 2012 · H. Jun 25, 2019 · Hey guys, Im putting in catless headers into my 04 330ci as well as deleting the SAP, wondering if there is anything I should be concerned about with the post cat 02 sensors. and less than 300 ppm of HC at idle to pass. ----- Make sure you apply Threadlocker or Loctight on the last couple of millimeters of thread before tightening. Don’t expect much more than 330 WHP out of an E46 M3 without dumping a great deal of coin. Oct 8, 2011 · Hey man , I have a 2004 325i E46 same engine as your ci , I removed the cats in the exhaust , not the headers , it has a nice tune on 1st gear and 2nd but otherwise , people might disagree with me here but I feel it just doesn't pull the same on the higher gears , example 120 in 5th , has a drone feeling like , its waiting for a reaction before it starts to go again . #12 · Jan 20, 2023. Shown to even have a bit more TQ in midrange power. However, catless downpipes do have their own issues, especially come emissions testing time. 3. Jan 23, 2017 · I put this set up on a m54 325. " You can try. cosmos///m3. Communication: 10/10. It’s a decision that shouldn’t be taken lightly, and weighing the pros and cons based on the specific application and desired outcomes is essential. Feb 10, 2016 · The JB1 does not eliminate a CEL from a downpipe. When Air/Fuel mixture ratios are computed by the O2 sensor to check if your car is running "optimum" they simply gauge if the car is running lean or rich. That’s why you should always make sure they stay tightly wrapped. Play my dyno vid below, it's an Ebay header & 16533. Much improved steering response, and that with a new alignment, I smiled all the way home from the shop. It all starts from when I installed my catless headers on my car. Jul 14, 2007 · Of course there are cons. Feb 29, 2024 · However, there are considerations to take into account such as the type of material used for wrapping and the potential for increased wear on the headers due to the heat concentration. #1 · Apr 24, 2017. 50] 2015 BMW M3 [0. C. May 3, 2024 · For all the trouble my install gave my mechanic, the sound is fucking perfect for me. Unrefined in power delivery - Seems like the power delivery is not smooth. Cons: Expensive. Install the new OEM gasket and aftermarket headers. Or I know of one Ebay seller that sells a perfect fitting 325/330 header for $820 LEV shipped. Here are a couple of pics of the headers and fitment/installed (sorry for pic quality and took horrible pictures lol) Here are some videos that I took the same day after installation. I personally don't notice the heat difference. Pro are more hp out of the x pipe over a catted pipe. A TIG Welded, entirely stainless-steel made (304-grade) 335/135 catless downpipe will cost around USD 650. #1. I have my original pipe taped up and hibernating just in case. Wow, a few of those header nuts were very rediculous to access. Running catless without a tune on 11-14 cars is a gamble as the non-foulers can fail pretty often on this setup. You are directly nerfing the power gains by going catted and it's no guarantee that you will pass emissions as well as not getting CELs, the same way your not Feb 17, 2022 · Lalo_e46 Discussion starter. Feb 20, 2010 · 11374 posts · Joined 2002. Fits on: LHD. Headers are generally lighter weight for the same size. EL: better power due to equal exhaust scavenging across all cylinders. And the gas gets denser, which makes it harder to push the rest of the way out the exhaust system. In stock. 525 Views 2 Replies 3 Participants Last post by vtwagon, A forum community dedicated to BMW E46, E90, and F30 owners and enthusiasts. Yes, that meant catless. #1 · Feb 17, 2022. But the sound doesn't appeal to some people. 81 posts · Joined 2006. #3 · May 14, 2021. If the vehicle is a street car though, then you Aug 22, 2013 · We may earn a commission for products purchased through links on this page Dec 24, 2010 · All things being equal on a boosted 6. Fitment: Exact fitment like OEM; all O2 sensors fit perfectly. 00] 1990 BMW 735i Turbo [0. I had to drive to an exhaust shop with open headers since the outlets didn't line up properly. These CATs exist to convert toxic exhaust gases into non-toxic ones. As the name suggests, catless downpipes do not integrate a catalytic converter. Smooth bends reduce turbulence and give your exhaust the straightest path to reduce back pressure. From supercharger kits, headers, and exhausts, to suspension and ECU tuning for your E46, we have it all. F10-N52 Discussion starter. Towards the end of tailpipe sniffing they introduced a *** test. No Cats can deliver a deeper and throatier sound. Mar 12, 2020 · Megan-$296. There is no performance difference, if anything the Catless is the better performer but again it won't be to a noticeable amount. I wonder how much quicker to 60 the new car is stock, vs a MK2 with header & stage 2 tune. Meanwhile, a short header can help increase 3 to 6 horsepower, and the long tube header usually gives 6 to 9 horsepower more (yet May 15, 2021 · 3600 posts · Joined 2013. Oct 7, 2008 · I replaced my OEM bushings at 65,000 with Powerflex bushings. Easy Installation and Stock Compatibility. Before headers, I could chirp second gear. Cons: Expensive and crap. There are both pros and cons to just about everything in life. Dec 29, 2020 · Straight to the point. Switching to an M3 (or any car for that matter) presents a level of risk as you will be taking a gmable on the new car. vat. 4L. As for rasp it won't sound that bad as some May make it seem. Posts: 39. I cringed at the pricing of Jackpot/Fullsac pipes, ended up buying a take-off exhaust system (yes, mufflers and all) for $100 and grinding out the cat guts. That is because the cooler temps and extra horsepower will benefit you. Active Autowerke. ----- Start with the header closest to the front of the car because it will be easier to maneuver the second header in. Our reputation has been proven on both the street and the track - making Active Autowerke your go-to Nov 9, 2008 · For those of you who did a catless header (example ebay headers) and did a full catback exhaust (example: highline, TSE3, Borla) - Not just muffler, complete system. For those wanting to see more of BMW's 4th generation 3 series, the beautiful and timeless E46 Members Online DIYING Catless Headers 330ci (AUTO) May 3, 2021 · Professional race teams spend a lot of time manipulating such to extract the maximum power from exhaust systems. Active Autowerke Sport Headers With Installation Hardware - E46 325i 325Ci 330i 330Ci - M54 Engine. Aug 8, 2020 · Join Date: Apr 2020. That’s a solid 10 horsepower and torque gain with the unknown tune. Jan 29, 2021 · Really depends on what you want. 4 SP, and loved the way mine sounded stock. They can increase power output by providing better flow rates, which also leads to reduced pollutants. Just tune it, you've already done permanent mods anyway like that rear valence with quad tips. I didn't notice any negative effects at all; I would recommend them. May 12, 2021 · BMW N54 engines have long been known to deliver great performance with a few basic bolt-on mods. In this guide, we compare N54 catless and catted downpipes, discuss pros and cons, and list some of the best DP Explore a comprehensive comparison between catted and catless downpipes, examining performance, emissions, sound, and other considerations that influence your choice. - M3's ride harsher Location: SoCal. They may all look the same, but where they connect to the exhaust is slightly different. You'll have to get a block off kit,or you can weld up the channels on the e36 m52 exhaust manifolds. Which the advent of such saw many a borderline cat or an aftermarket camshaft get replaced. the headers get red hot and it can actually temper the steel and make it weaker. May 20, 2011 · well these are the codes i had after install, not saying all these codes are from the headers but this is what i have. The DME will then rely on the front pair of O2 sensors and the stock EGT sensor only. May 3, 2015 · To me a master plan starts with taking care of all your needed maintenance items, then move on the HP. 0L twin turbo engine to the next level. The catless downpipe gives an extra 25 hp without tuning and 50 hp with tuning. The only thing I really do notice is the signature straight pipe sound. Manufacturers have more freedom of pipe length and routing with more compact headers (more on that later). Jun 14, 2023 · Generally, upgraded downpipes made with catalytic converters can gain 10 to 20 horsepower. Jul 30, 2009 · 4) NISMO headers, with or without cat. 39 posts · Joined 2020. 08-08-2020, 04:29 PM. Boss IM, Procharger D1SC Stage 2 kit, 12psi, E85, ID1000, MMR OPG/CS, Circle D 3C, DSS 3. Dec 22, 2015. Apr 7, 2020 · We believe catless downpipes are the second-best bolt-on performance mod for the B46 and B48 engines, following only tunes. Active Autowerke offers some of the most powerful and popular BMW E46 tuning products on the market. M54,M52 are the same except for the amount of studs. It helps to have intake mods and cams to make the headers really flow. I rather doubt (sorry) a set of EBay headers and randomly chosen straight pipe will produce more power other that it sounds faster. Bypass and delete SAP and Rear O2 sensors for your catless headers and track cars. That white box header was a very good fit, and is still nice & shiny, with just 5K on the car. Catless downpipes are one of the best mods for performance you can do to your N54. 1 Hemi with long tube headers, would catless mid pipes make substantially more power than the hi flow cats? I know about the exhaust fumes without cats and is tolerable if the HP diff is great. And the CLK has a 4. Catless is also bad for the environment, and not street legal (for off road use only). Y. x ecu. The hot tip in S52/M52 engines these days seems to be SunBelt cams and shorty headers from Bimmer World. May 3, 2000 · E46 (2000-05) BMW 3-Series Tuning. I read that some people get the euro 2 tune, or non foulers, etc. Downpipe (DP) upgrades are among the best mods to take the 3. 665 posts · Joined 2010. Constructed of 100% 304 Stainless Steel, these Active Autowerke exhaust headers eliminate the factory catalytic converters to promote the flow of Aug 21, 2011 · 240 posts · Joined 2011. ea-catalyst effciency below threshold cyl 4-6. OP, Buy the BimmerBrakes Headers for $255, guaranteed fit for 325/330. BW Part #: 11-009. Too much heat for the steel. You shouldn't need flow bench numbers when you look at this picture with your trained eye. PBD Tuned. Our long tube off-road header is a Tri-Y design to allow the exhaust gasses to flow more freely from each of the 6 cylinders and combine in a more efficient manner. #3 · May 2, 2014. Cary. However, the cons far outweigh the pros: failed emissions, terrible exhaust smell, horrible for the environment and switched on check engine light (CEL) I cover more about catted downpipe vs catless downpipe in this article. Sep 26, 2005 · It all depends on header design. Tantamount to most cold air intakes actually loose power over the envelope. V Band Clamp from Downpipe/Catalytic Converter to Turbo – 13Nm or 9. Slight performance/MPG improvements. comments sorted by Best Top New Controversial Q&A Add a Comment Sep 9, 2014 · Cons are it's sounds raspy (but also depends on the rest of the set up) , it leaves a smell (some actually like it). 5) Replacement Nissan headers with pre-cat. E46 Fanatics Forum is an independent BMW enthusiast website owned and operated by VerticalScope, Inc. Usually a good option if you are going for further tuning. e2-after cat fuel trim system cyl 4-6. #2 · Aug 21, 2011. 3 V8. Think of it as a damper between the clutch cylinder and clutch mechanism. 1892 posts · Joined 2017. Pros: Catless DP will reduce the back pressure therefore better flow. Here are some cons: - You know the state of your current car. UEL: By grouping exhaust pulses of certain cylinders together, you get a more pronounced rumble, but some cylinders won't get as good exhaust scavenging. and recently got these codes, idk what they mean or how Performance Headers. Catless headers and muffler delete Feb 11, 2022 · Didn't break the bank, either. Cons: Large power gap before 3000 RPMs - Power surge happens right at 3000 RPMs and the tune doesn't feel like it kicks in until then. 00] 2015 BMW M5 [0. Rob43. Dec 24, 2023 · A little brake down on what’s happened so far. Accuracy on description: 10/10. Add a stock Euro section one, or a catted section one from CPI to retain cats for emissions. OEM headers have the ratio programmed. There are a few problems when it comes to the factory manifolds of the E46 325I 330I, which are the reason owners aren’t releasing the full potential of their BMW. Coatings really help with Turbos. BMW X1 Catless Downpipe (3. 00] Removing the secondary cats will not provide much of a performance difference, but will significantly increase the raspyness from our experience. Question : Once catless headers are installed , can the you smell the combustion/exhaust fumes in the cabin? I currently have stock headers with RE midsection and Eisenmann Exhaust. $300. E46 M3 Catless Headers Install. #6 · May 7, 2013. *These are intended as home/office decoration and not to be installed in any way that violates your local laws, Revmatch Motorsport is not responsible for any Catless UEL been thinking about installing a catless UEL header to my FRS and was wondering what the pros/cons are and if i have to buy an OFT immediately with it. Shiny and Decorative, High-flow performance exhaust manifolds for 1999-2006 BMW E46 325/330 or 323/328 (m54 or m52tu) does not fit RHD models. Oct 5, 2015 · E46 Fanatics Forum is an independent BMW enthusiast website owned and operated by VerticalScope, Inc. It will be interesting to see if there are as good of gains to be had, with similar mods, on the new 2. After headers, it would squeal a bit more than a "chirp". People buy Catless for the quieter sound and the perception that it is significantly better Nov 14, 2011 · 6891 posts · Joined 2009. Sent from my SM-G920P using E46Fanatics mobile app. Then cut & weld in the Magnaflow Race Cat #54904, about $91 each, you'll need two. Just want to know what to do so that the car will: A. Does anyone know how much does it make a difference on having cats vs not for exhaust fumes? Megan Racing header are stainless steel and polished to a mirror like finish and constructed using beautiful and strong welds. 00. #5 · May 4, 2012. It is posible to tune headers for any part of the power band. You may need to alter your Cat-Back exhaust because the shorter header in the picture may have to be extended 2-4". They are indeed cheaper and can provide a little more horsepower. Tech notice cracked front control arm bushings when service was being peformed. May 7, 2019 · I had eBay headers on my first E46. It’s stock from basically directly under the passenger seat back, and has the Schmiedmann center section with high flow cats and catless headers. This does not bother me, and I would imagine the smell is less the leaner your tune is. Condition of the item: New. Stage 2 tune from revmatch will be on the way soon Mar 6, 2019 · Should the header wrap start to unravel, Thor reminds us that a loose piece could get wrapped up in the engine’s pulley system. D. Pros: Legitimate repair, keeps the car perfectly stock. Proper bungs and locations for O2. 100% T-304 Stainless Steel with a Polished Finish. sold out. If you replaced the stock exhaust manifolds with headers and put on a high flowing aftermarket cat, or got rid of the cat, this would be a different story. For me, the E46 M3 only sounds best when paired with catless headers. Jul 14, 2023 · High Flow Cats and No Cats both have their respective pros and cons. 5”) Such a Catless Downpipe is also made with 304-grade supreme quality stainless steel that can be obtained at $350. #2 · Dec 4, 2015 (Edited) Make your own headers, its been done many times before & you can control the quality. 41 posts · Joined 2014. Come Jul 2, 2013 · Don't think the shark completely disables them like other tuners. Cons: Sort by: Draco-REX. On the other hand, catted MSRP Price: 999. #11 · Dec 5, 2015. Sep 1, 2021 · Catles headers are ebay and muffler from amazon. Most older cars just needed 3% or less C. #8 · Feb 20, 2010. Definitely interesting to note all the Design style #1 headers are cheaper than the Design style #3 ones, and design style #2 are the most expensive. Who here has catless headers, any details on overall engine performance, response, sound and smell comparing stock to catless headers? Anyone also have a 3 stage manifold as well? How much power and torque to the crank can I expect with both these mods and a good tune? Today will be overviewing the catless ebay headers I installed on the car with a full sound checkSkip to 4:30 for sound check ;)Feel free to follow me on soc Jul 18, 2021 · Catless downpipe is an aftermarket downpipe that does not equip any catalytic converter (CAT). Thankfully I live in a non emissions state ( but NO racetrack!) Sound will def be louder. A typical downpipe comes with 2 CATs. hamadyr. 5" Aluminum Driveshaft, Ford Racing half shafts, Stainless Works Long Tube Off Road headers, Gibson 3" cat back. 323/328 headers are different from 325/330 headers. Since you are going to reprogram to bypass the light error, the only way you can answer your question is May 24, 2005 · chmdrm said: You lose part of the DMEs ability to tune the motor. Wrap is not good for stainless LT's. e9-catalyst effciency below threshold cyl 1-3. Customer Reviews. High Flow Cats can provide improved fuel economy and a slightly better sound compared to No Cats. . e1-after cat fuel trim system cyl 1-3. Dec 4, 2015 · 6891 posts · Joined 2009. Currently installing catless headers. O. The headers do not fit on to the M52TU Midpipe plug and play. Jan 19, 2023 · 8HP70Z Gearbox on E46 || M4 DCT on E46 Project || Low CR Built M54B30 Project || Mega Subframe Reinforcement DIY. Jan 21, 2022 · im considering of going a route of catless headers for my e46 325i. Thus the reason for free flowing catless headers. Oct 18, 2020 · Well, the answer is if you are a racer, then without a doubt yes you should wrap your headers and exhaust system. sm ol ea oh fq ud yb sb ne lm