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Old 03-25-2020, 10:44 AM   #1
jaga
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Is 330Ci exhaust similar to 325iís?

Hi all
My car is a 2002 325i auto sedan.
My next project is to make 6MT swap. I got a donor car which is a 2004 330Ci.

I am also thinking to take the complete exhaust pipes and the exhaust headers.
Are those parts Interchangeables?
If so, will the 325i sound improve?

I have checked realoem but exhaust headers show different part Numbers, however fcpeuro show es that they fit both M54 motors.

I appreciate your comments.


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Old 03-25-2020, 10:45 AM   #2
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The exhaust manifolds for a 330 will fit a 325 and vice versa. 328 and 323 manifolds are different where they connect to the rest of the exhaust. My experience is the sound will not change. For that, add an aftermarket muffler or delete one or both resonators.
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Old 03-25-2020, 10:50 AM   #3
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Great. That was my initial idea, bit needed to be aire. Thanks a lot for your fast response. Happy 3-25 day


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Old 03-25-2020, 10:57 AM   #4
smolck
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Originally Posted by jaga View Post
Great. That was my initial idea, bit needed to be aire. Thanks a lot for your fast response. Happy 3-25 day


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No problem. By the way, I just replaced my cats with true headers and I went to my local metal recycle place with the old cats, they gave me $80 a piece for them, so if you have extras lying around, may want to sell them to your local recycler and make some $$$ to help get that 6 speed in there
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Old 03-25-2020, 01:35 PM   #5
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I thought the 330 exhaust piping was larger diameter,
but that's only from having to lift the 325's and the 330's, and thinking the 330's was heavier.

Not very scientific,

t
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Old 03-25-2020, 03:10 PM   #6
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Best to look up the exact part numbers of your VIN and compare parts pictures of the cats/downpipes/flange orientation and the middle section to that of what you desire to install.

Short version.
Had a customer with a high mileage 325. Had clogged cats. Sourced used cats and the flange had different orientation and would not bolt up.

Luckily we had a new take off mid/rear section that fit. I wasn't about to repeat the cat R&R for a mis-match with the flanges.

It was so long ago I don't have the model information in my database any longer.
Just take 5 min and check.
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Old 03-25-2020, 03:15 PM   #7
smolck
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Originally Posted by TobyB View Post
I thought the 330 exhaust piping was larger diameter,
but that's only from having to lift the 325's and the 330's, and thinking the 330's was heavier.

Not very scientific,

t
Same part numbers in realoem, save for the mufflers which are different depending on year/options. But the exhaust manifolds (cats), pipe diameter, front resonator and rear resonator are all identical. 2" if memory serves.
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Old 03-25-2020, 04:00 PM   #8
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I thought ci e46ís had longer headers on the flange side. Due to coupe/vert vs sedan. I can imagine that cat back could be the same length. Since the extra length is at the cat flange.

I also believe that the 330 has the valve flap in the muffler and the 325i doesnít.
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Old 03-25-2020, 05:37 PM   #9
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Originally Posted by Aidzer0 View Post
I also believe that the 330 has the valve flap in the muffler and the 325i doesnít.
Some 325s do have the exhaust flap.
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Old 03-25-2020, 09:07 PM   #10
smolck
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Quote:
Originally Posted by Aidzer0 View Post
I thought ci e46's had longer headers on the flange side. Due to coupe/vert vs sedan. I can imagine that cat back could be the same length. Since the extra length is at the cat flange.

I also believe that the 330 has the valve flap in the muffler and the 325i doesn't.
I just put headers for a sedan on my coupe. No differences, bolted right up. And once again, realoem.com lists 325 sedan exhaust manifolds as the same part number for my 330ci.

Quote:
Originally Posted by BaliDawg View Post
Some 325s do have the exhaust flap.
Yep, which is why realoem.com shows multiple part numbers for the muffler based in mtech package or not.
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