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Old 09-28-2004, 01:09 PM   #1
chitown
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Aftermarket exhaust piping question

Need some help, I'm supposed to be getting a Brullen catback system this weekend, and what I want to know is, what's the diameter on my stock 328 system? And since Brullen offers 3", 3 1/2". 4" and 5" Diameter, I don't know what I should be getting. Will I get any performance increase with any of those? Tried doing a search on this but couldn't find a straight answer. Any help would be appreciated
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Old 09-28-2004, 01:35 PM   #2
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I wouldnt wan't to be going larger than probably 3" as the larger you go the lesser amount of backpressure which is only going to be advantageous hp wise for a bit. Generally people only use a 4" or larger if the car has a turbo.

Feel free to correct me on this though.
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Old 09-28-2004, 01:54 PM   #3
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You are very likely looking at tip diameters. Those are not piping sizes.
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Old 09-28-2004, 01:56 PM   #4
chitown
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OK...I'm a newb...will their piping from the cat back be the same size as I have now, and just different diameter tips? Need some advice
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Old 09-30-2004, 07:42 PM   #5
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bump, planning on getting this on saturday and need a little help
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Old 09-30-2004, 08:21 PM   #6
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don't they usually bump up the inlet piping to 2" 1/4? 3 inch is bug, as Jay said it is probably the tips they are talking about. My brullen inlet was a 2"1/4
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Old 09-30-2004, 08:25 PM   #7
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OK thanks, learn something new, thought that you get to choose the inlet size which I wasn't sure of...appreciate it
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Old 09-30-2004, 11:23 PM   #8
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i hate loud exhausts, i dunno, its just not me, i bought a ACS wide chrome tip, i think it looks sweet adds a few decimal levels to teh sound but almost nothing, plus BMW stock exhausts are rated very high. thats just my .02
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Old 09-30-2004, 11:30 PM   #9
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I'm sure they are but my car is dying to come out of it's shell and just ****ing scream
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Old 10-01-2004, 08:30 AM   #10
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if you don't want to go to big justr tell them to go the next size up from the stock exhaust, that's what I did with mine, be sure to ask for the quiet exhaust because even for quiet it's pretty loud
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Old 10-01-2004, 08:57 AM   #11
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plus BMW stock exhausts are rated very high. thats just my .02
Thats why I love my M3 ehaust
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Old 10-01-2004, 12:22 PM   #12
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One more question, is Brullen's catback system ONE piece, or is it the muffler with CUSTOM piping? Because if it's custom I could just buy the muffler and get the piping done cheaper right? Please correct me ASAP
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Old 10-01-2004, 01:13 PM   #13
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Thats why I love my M3 ehaust
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Old 10-01-2004, 01:50 PM   #14
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2.5" inlet should be enough. I wouldn't go 3" unless you go forced induction.
I think stock is 2 1/4"
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Old 10-01-2004, 06:41 PM   #15
chitown
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Doesn't look likely that I'm getting it this weekend, I tried calling Brullen all day and didn't get an answer once, either they were real busy or just not answering the phone, heh.

Bump on my earlier post too...

-> One more question, is Brullen's catback system ONE piece, or is it the muffler with CUSTOM piping? Because if it's custom I could just buy the muffler and get the piping done cheaper right?
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