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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 11-12-2012, 06:23 PM   #1
sbcrazy
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Question m3 stock headers on 325 m54b25

Hi everyone. So this is what I was thinking. I have a 02 325i. the Cat is going bad (rattling) and I am in need of new ones. I have looked at exhaust options, Headers w/cats, headers w/o cats w/ o2 sims, and oem/ aftermarket manifolds w/cats.

I was wondering if anyone has ever tried using m3 headers w/cats on a non-m car.

I know the flanges don't match the block so you would have to cut the old (325) flanges off and install on (m3) headers. not sure about section 2 alignment from (325)->(m3)

I have been thinking about taking on this project and I'm testing the waters to see if anyone has tried this before. Thanks

p.s. I live in Ca so Smog is a must, otherwise I would run 325 aftermarket Headers.

~Lance
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Old 11-15-2012, 08:12 PM   #2
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Really, no input.....

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Old 11-16-2012, 07:57 AM   #3
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I'm not aware of anyone giving this a try, most just seem to opt for the cheapest headers they can find. Good luck if you decide to go for it.
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Old 11-28-2012, 09:58 AM   #4
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From what I've read the E36 shorty style headers will bolt onto the m54b25/b30 blocks, but from there would require some exhaust work to mate the headers to the exhaust, so using an OEM e36 mid pipe for the header connection, then a cut/weld job to the existing E46 piping might work. I thought about pursuing this, then just figured it's a total waste of time and money for only about a 10bhp gain. Not the mention chasing after Check Engine lights and worrying over inspections.
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Old 11-29-2012, 04:29 PM   #5
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Thanks. Looks like either way I go I'll have some work to do.
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Old 11-30-2012, 02:20 PM   #6
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O2 sims won't allow you to pass emissions anyway.
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Old 11-30-2012, 05:26 PM   #7
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If I used o2 Sims I would put cats downstream past the headers. The cats would have quick releases on them so I could put them on for smog and take them off after.
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Old 12-01-2012, 07:08 AM   #8
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Why would you need O2 sims if you have cats? I'm confused.

If you put a cat in the system you might as well just run O2 sensors and leave the cats / sensors in all the time.
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Old 12-01-2012, 08:31 AM   #9
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Quote:
Originally Posted by sbcrazy View Post
If I used o2 Sims I would put cats downstream past the headers. The cats would have quick releases on them so I could put them on for smog and take them off after.
Technically this wouldn't be legal either as the cats wouldn't be in the stock location.
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Old 12-01-2012, 09:59 AM   #10
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O2 sims would be for eBay headers since they do not have cats on them.
And with most BMW cars you can get away with cats downstream because CA SULEV cars have 4 cats. 2 on the manifold and 2 downstream. The smog shop doesn't lift the car up and inspect that here in orange co. You just drive in on rollers.

Still seams like a lot of crap to deal with if I went that route. I'm still leaning on the stock m3 headers with a custom head flange. Cats and o2's would be in stick locations so no cel lights hopefully...
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Old 12-01-2012, 10:47 AM   #11
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What you can get away with and what is legal are two different things.
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Old 12-01-2012, 08:09 PM   #12
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But O2 sims don't work. They may make your CEL go away but your DME will still not show a ready flag, meaning you'll fail a smog check.
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Old 08-08-2013, 11:00 PM   #13
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Ok so the "Frankenheader" project is going to start this weekend. I've got the parts to do it. here are some pics to show how close they are.
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Old 08-08-2013, 11:04 PM   #14
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Old 08-08-2013, 11:07 PM   #15
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Old 08-08-2013, 11:32 PM   #16
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Re: m3 stock headers on 325 m54b25

Sub'd for results

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Old 08-10-2013, 10:47 AM   #17
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I am very interested on how this will pan out. sub'd
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Old 08-10-2013, 10:29 PM   #18
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Nope. It did not work. The m3 headers hit the bell housing and the pipes are at the wrong angles. Maybe if I had a shop I would attempt this, but doing it in the street and only 2days with the car before having to use it for work doesnt work. Also the oval pipes on the stock manifold would need a lot of re working. But an idea would be to use s50 headers. Those have the right manifold mount for the m54b25. Just add cats if your trying to be legal.

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Old 08-10-2013, 10:55 PM   #19
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..

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Old 08-10-2013, 11:43 PM   #20
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Re: m3 stock headers on 325 m54b25

What is up with the pic must see!!!!!!!

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