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08-28-2013, 10:35 PM | #1 |
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Header FAQ - US vs Euro vs CSL
For anyone wanting to buy headers that are not familiar with Euro Headers and Euro Cats (section 1), here's a summary of what I learned when researching mine. I hope it saves someone the time I spent. Feel free to make corrections, add any information or ask questions.
-US Z4M has two sets of cats. The primary cats in the headers and the secondary cats in the section 1. The US Section 1 has smaller cats as they were intended to be secondary cats. -Euro Z4M only have a set of primary cats in the section 1. Euro section 1 has the required bungs, so it doesn't require modification. CSL and Euro headers CSL and Euro headers are very popular because they don't have the additional set of cats built in that US cars come with and give a nice HP bump. They also sound great. -"Euro Headers" refer to the European M3 headers. They are fully compatible with Z4Ms -"CSL Headers" refer to the Headers used in the M3 CSL and the European Z4M. If you want the authentic headers that came with the Euro Z4M (and legendary CSL), you want the CSL headers. There are some slight differences between these and the Euro Headers, including being lighter. Most people run Euro headers because CSL headers are more expensive and harder to find. Euro Section 1(Cats) Euro Cats are very sought after because they eliminate the need to modify your US Section 1 to accommodate Euro or CSL headers. They are rare because although we can use the Headers from the Euro M3, their section 1 doesn't fit. So compatible "Euro Cats" only come from Euro Z4Ms. -US Section 1 To run either Euro or CSL headers without throwing CEL requires the US Section 1 to be modified. You must add bungs for O2 and EGT. They need to be cut and have the bungs welded in. US Section 1 contains smaller cats than Euro section 1 because they were intended to be secondary cats. -Euro Section 1 These already has the necessary bungs as they were designed to run with the Euro and CSL headers. No modification/welding to section 1 means less headache and less chance for something to go wrong. Additional Notes While you don't have to modify the Euro Section 1 to relocate the o2 sensors, you will need a method of extending the o2 sensors that were previously connected to the headers, that now need to reach to the rear of the section 1. The two methods for this are cutting and extending the o2 sensors, which is risky and can cause CEL if not done professionally and the popular safer method of unraveling and rerouting the existing o2 sensor cable as-is, so it fits. Below are some useful links. Thanks to Finnegan, Beta, Marinb, Gferil and authors of all the threads below. Header Install Relocating O2 Sensors Wiring O2 sensors Picture of Euro Cats showing where EGT and O2 go
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|Evolve Airbox - Euro Headers - Strömung Exhaust - H&R Coils - 19" BBS CH-R| Last edited by Devious21; 08-28-2013 at 10:54 PM.. |
08-28-2013, 10:43 PM | #2 |
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also, the bungs must be 90* if you're not going to tune for the catless headers
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
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08-29-2013, 06:00 AM | #3 | |
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08-29-2013, 10:14 AM | #4 | |
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The US Section 1 doesn't have any bungs. For US cars, the headers were designed to do this job. If you move to Euro headers but keep the US Section 1, neither part has a place for post-cat o2 or EGT sensors, as neither part was designed to do this job. You must add bungs to the US section 1 so you can plug them in OR get the Euro Section 1 that already has the necessary bungs built in.
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|Evolve Airbox - Euro Headers - Strömung Exhaust - H&R Coils - 19" BBS CH-R| Last edited by Devious21; 08-29-2013 at 10:21 AM.. |
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08-29-2013, 10:18 AM | #5 | ||
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Question from the original thread:
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Running a setup with no (primary or secondary) cats -Better performance (less cats are always better) -Worse smell (running no cats can be toxic) -Will have to deal with CEL. Either live with it or get a tune that ignores it(of find some creative way to simulate it). I'm assuming you won't be attempting to smog. Running with Euro headers/Cats -Still better performance than stock US cars (deleting a full set of cats) -No smell (big primary cat. This is the OEM euro setup) -As long as install is done correctly, your car won't know that it's even modified. Will still pass smog. Quote:
If you are looking for a used set (as most of us are), PM Donovan. He should be able to get you a set at a good price direct from the UK.
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|Evolve Airbox - Euro Headers - Strömung Exhaust - H&R Coils - 19" BBS CH-R| Last edited by Devious21; 08-29-2013 at 10:27 AM.. |
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08-29-2013, 05:27 PM | #7 |
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I've seen it inaccurate both ways. At the end of the day, the only prices that are important are the ones you can actually order a part for, so you want to get pricing from someone that actually sells parts. I use getbmwparts.com to check prices. Realoem is for part reference only.
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|Evolve Airbox - Euro Headers - Strömung Exhaust - H&R Coils - 19" BBS CH-R| |
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08-29-2013, 11:11 PM | #9 |
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Very good summary Devious.
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09-11-2013, 03:21 PM | #10 |
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Thanks for doing this btw!
Question: I have an ESS tune (came with the VT2-500) and am currently on 100% stock USDM exhaust. I will be installing euro headers soon and am hoping someone with a similar setup will chime in. Do I need to worry about getting a CEL even though it has an aftermarket tune? My intuition tells me that yes, I will still throw a CEL and have to request a re-tune. I'll most likely install *just* the headers for now. Anyone know if the Evolve-R cable for E46 M3 works for Z4M? |
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09-11-2013, 05:48 PM | #11 | |
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If you JUST do headers, either your car will pop CEL like a non-F/I or it's possible that the tune has the post-cat 02 or other sensors as "not ready", in which case it may not trigger CEL. I know there's a few guys selling their modified section 1's, ready to go for less than $700 shipped. I can put you in touch with them if you want to go that route. Regarding the Evolve-R cable, I'm pretty sure it works but I shot a note to Evolve to have them confirm.
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|Evolve Airbox - Euro Headers - Strömung Exhaust - H&R Coils - 19" BBS CH-R| |
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09-12-2013, 09:23 AM | #12 | |
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You sir, are a gentleman and a scholar. Makes me proud to be part of a community willing to contribute in a manner such as this. Thank you! |
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09-12-2013, 09:45 AM | #13 | |
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So there's a bit of a catch on the Evolve cable. From Evolve, on whether the e46m3 cable will work on a z4m:
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09-12-2013, 09:58 AM | #14 |
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04-11-2017, 03:26 AM | #17 | |
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I'm not 100% on EGT, but I believe it's the same as above. I know EGT can reach on the DKF s-pipe without soldering in more wire length. RossBMWZseries
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04-11-2017, 01:16 PM | #18 |
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Pokey is correct on the EGT; I was able to reach it on the DKF Spipe with no modification.
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