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03-02-2021, 08:56 PM | #1 |
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What extras are needed to swap exhaust headers?
Hi all,
I need to swap my track exhaust headers to smog-compliant headers. I've not done something like this before, so I'm wondering what "extras" are needed. Things I know about: Manifold gasket x6 O-ring where each header meets the next exhaust piece x2 Anything else? Also, does anybody have any good DIY videos are articles they could link?
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03-02-2021, 09:36 PM | #2 |
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That's probably enough for a West Coast car. For anything that sees winter on East Coast, I'd probably replace some of the fasteners too and get ready to break out the grinder. Practically speaking, I leave header install to pro mechanics because it's hard work and I would just spend double time on it, sweating and swearing. There is a reason why it's 3-4 hours of labor in $ even if it takes 2.
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03-02-2021, 10:22 PM | #3 |
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I'll be quite happy if it takes me 8 hours, since I've never done this before.
The headers were swapped less than 2 years ago, so that combined with it being a FL/CA car, I'm hoping I shouldn't break anything.
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03-03-2021, 09:58 AM | #4 |
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Overall it's a fairly straight-forward job, although I agree can be quite the pain in the ass depending on how many seized bolts you may have.
Here's a pretty good DIY guide: https://www.billswebspace.com/BMWZ4M...stallation.htm You've listed basically everything needed, but I was told I should do the CPV o-ring as it's common to leak and a major pain to get to normally but it's only a 3 minute job if the headers are already out.
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03-03-2021, 01:09 PM | #5 | |
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What does the CPV do? I'm not familiar with it from my M54 cars. I see in the notes from the PO that it has been changed already.
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03-04-2021, 08:32 AM | #6 | |
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DIY for that here. You'll see how easy it is with the headers off, but with them on you'll have a fun time.
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03-04-2021, 09:25 AM | #7 |
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Do M54 cars have CPV? I've only heard the problem being on S54 cars
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03-05-2021, 10:51 AM | #8 |
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I have 2 M54 E46s and I've never seen or heard it mentioned anywhere, but I've seen it about 20 times already since I bought my M Coupe.
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