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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > 2.25" exhaust?



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      10-20-2018, 01:37 PM   #1
Valant
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2.25" exhaust?

At the moment I have a muffler delete with a 3" downpipe from the resonator. I'm interested in getting a straight pipe 2.25" all the way back from the primary cat. Thoughts? I got an N52 btw.
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      10-20-2018, 01:56 PM   #2
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I had straight pipes for a few months on my 335i. If you still have cats plus resonator, it might be ok. However i had no cats, no mufflers, and vibrant resonators and it was so damn loud that i had to get a full exhaust.
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      10-21-2018, 12:27 AM   #3
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Originally Posted by The_E90_Fan View Post
I had straight pipes for a few months on my 335i. If you still have cats plus resonator, it might be ok. However i had no cats, no mufflers, and vibrant resonators and it was so damn loud that i had to get a full exhaust.
I'd assume an N54 would be louder than an N52 with the same setup. I'm not entirely knowledgeable on the subject
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      10-23-2018, 07:37 PM   #4
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Ive seen a few 28i around with louder than usual exhaust. I cannot say what they had done, but some sounded better than others. Id do some youtube sound clip searching for what you like.
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      10-23-2018, 09:03 PM   #5
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no less then 3 inch or it will sound super tinny and rice i would go with 3 or 3.5 thank me later...

i can post a vid tomorrow if you want to hear what 3 inch from primary kitties back sounds like i also have a 3 inch straight threw muffler half way down...
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      10-24-2018, 05:18 PM   #6
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Also does lots of pop pop if i blip the throttle on downshifts didn't get any clips but here what I got...

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      10-24-2018, 11:10 PM   #7
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the *stock* single pipe is bigger than 2.25" - that's barely enough for 200hp.

don't do dumb shit with your exhaust, there's actually science and engineering behind it. You'll just sound like a dumb ricer with loud obnoxious exhaust, with nothing to show for it but a headache.
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      10-25-2018, 10:40 AM   #8
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Without knowing your goals for this project, how can we provide much thought on the matter?
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      10-25-2018, 03:47 PM   #9
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My muffler deleted N52 is plenty loud, so I don't know what else you're trying to get out of changing your exhaust further. More noise? Better performance? I agree with atmosphericM that you should specify the goal when you're inquiring about exhaust mods.
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      10-25-2018, 03:58 PM   #10
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Quote:
Originally Posted by hassmaschine View Post
the *stock* single pipe is bigger than 2.25" - that's barely enough for 200hp.

don't do dumb shit with your exhaust, there's actually science and engineering behind it. You'll just sound like a dumb ricer with loud obnoxious exhaust, with nothing to show for it but a headache.
That was a little harsh, he's a kid asking a question about his exhaust, cut him some slack. OP, as stated before, try to stay away from anything under 3". Check youtube, there are tons of videos posted where you can try to find the sound you're going for. Me personally, I would try to stay away from making it sound like a rice rocket but it's your car, make it sound the way you want it. I'm straight piped turbo back and my car sounds somewhere between a jet engine and Cummins, some might not like it but I love it.
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      10-26-2018, 10:07 AM   #11
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Not looking for a rice rocket but it's a little quiet after it warms up. I don't want something crazy just a little louder at idle and a bit more burbles. The ones I get now sound like bubbles being popped in a cartoon haha

@AP888 I'd love to hear a clip
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      10-26-2018, 08:19 PM   #12
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Quote:
Originally Posted by Valant View Post
I'd assume an N54 would be louder than an N52 with the same setup. I'm not entirely knowledgeable on the subject
turbos actually quiet an exhaust pretty substantially.
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      10-26-2018, 09:18 PM   #13
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Quote:
Originally Posted by nsjames View Post
Quote:
Originally Posted by Valant View Post
I'd assume an N54 would be louder than an N52 with the same setup. I'm not entirely knowledgeable on the subject
turbos actually quiet an exhaust pretty substantially.
Quote:
Originally Posted by nsjames View Post
Quote:
Originally Posted by Valant View Post
I'd assume an N54 would be louder than an N52 with the same setup. I'm not entirely knowledgeable on the subject
turbos actually quiet an exhaust pretty substantially.
Oh interesting, never road in anything aside from a turbo diesel but cool
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      10-30-2018, 02:28 PM   #14
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I'd suggest deleting your rear (secondary) cats, then.
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      11-04-2018, 11:07 PM   #15
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I have custom exhaust components for sale - cheap. I do not recommend under-sizing the exhaust or a muffler delete.
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