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      06-15-2010, 02:11 PM   #1
quality_sound
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exhaust noise (chuffing)

Do all E9x M3s sound like they have an exhaust leak? Not like a 70 Mustang with a rusted exhaust, but more of a chuffing sound like the pipes aren't completely sealed? It's really noticeable when driving past raised barriers or in a tunnel.

Thanks all.

Paul
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      06-15-2010, 02:15 PM   #2
kitw
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Mine only does that when it's warming up.
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      06-15-2010, 02:16 PM   #3
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Quote:
Originally Posted by kitw View Post
Mine only does that when it's warming up.
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      06-15-2010, 03:54 PM   #4
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Are you running stock exhausts? If so, they do tend to have a bit of a "chuffing" or "whispy" / "airy" sound, due to their mechanical sound absorption manuf'g characteristics. A 'free flow' sound absorption system, such as on most of the performance exhausts offered, will tend to run a more realistic sound, w/out that "chuffing". I like the REMUS' I've run on all my Bimmers. Not too loud, but deep, and only loud when I throttle it hard. On the newest M3's (I only wish I could afford :-) they have two versions I believe. A Sport version and a Race version. If you are running an aftermarket system, some use that O.E.M. style baffled / chambered style of sound absorption, and may "chuff" a bit as well.
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      06-16-2010, 06:09 AM   #5
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Ahhhh, yes I'm running the OEM exhaust. Thanks for the info.
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      06-16-2010, 10:26 AM   #6
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No problem. I've been doing some research on performance exhausts lately, just thought I'd share a little of what I've learned... I was all set to get my used E 92 M3 from a dealer near here, got all psyched about it, and something came up with my other car, my E 36 M3, (a little spendy...) now I'm not able to pull it off... For a while at least. Had my REMUS "U.S. Sound / Race" exhaust on hold and everything... Ouch. Called 'em up, they were cool about it.
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      06-16-2010, 11:09 AM   #7
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They all do that. It's because of the thin headers. Or simply headers. Most other cars have a big a$$ exhaust manifold that's way quieter than headers. If it was a leak it'd make a loud racket. This particular noise is pretty obvious when just starting the engine, and when putting a load on the engine and driving by a wall, barrier, etc. Sounds cool, actually .
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      06-16-2010, 11:43 AM   #8
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Yeah, it definitely dies down a lot when the SAI closes it was just something I'm not used to hearing after the cats warm up.

As long as it's normal it's all good.
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      07-13-2011, 04:02 PM   #9
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Quote:
Originally Posted by quality_sound View Post
Yeah, it definitely dies down a lot when the SAI closes it was just something I'm not used to hearing after the cats warm up.
SAI?
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      07-13-2011, 04:15 PM   #10
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Quote:
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SAI?
I think it means secondary air injection. I believe it helps the cats light off earlier.
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      07-13-2011, 04:48 PM   #11
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Ah -- thanks.
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      07-13-2011, 04:57 PM   #12
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Whoever it sounds cool is crazy...it makes the car sound like complete shit it sounds exactly like an exhaust leak.
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      07-13-2011, 06:54 PM   #13
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Quote:
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Whoever it sounds cool is crazy...it makes the car sound like complete shit it sounds exactly like an exhaust leak.
It rocks. It lopes like a cammy dragster. I love it.
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      07-13-2011, 07:43 PM   #14
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Originally Posted by serranot View Post
It rocks. It lopes like a cammy dragster. I love it.
you are confused
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      07-13-2011, 07:53 PM   #15
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only does when cold start
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      07-16-2011, 08:48 PM   #16
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Quote:
Originally Posted by randy McMann View Post
Are you running stock exhausts? If so, they do tend to have a bit of a "chuffing" or "whispy" / "airy" sound, due to their mechanical sound absorption manuf'g characteristics. A 'free flow' sound absorption system, such as on most of the performance exhausts offered, will tend to run a more realistic sound, w/out that "chuffing". I like the REMUS' I've run on all my Bimmers. Not too loud, but deep, and only loud when I throttle it hard. On the newest M3's (I only wish I could afford :-) they have two versions I believe. A Sport version and a Race version. If you are running an aftermarket system, some use that O.E.M. style baffled / chambered style of sound absorption, and may "chuff" a bit as well.
this!
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      07-17-2011, 07:08 AM   #17
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Originally Posted by GreasyGinzo View Post
you are confused
Lol! Perhaps.
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      07-17-2011, 08:01 AM   #18
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That is normal, the sound is coming from the headers.
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      07-17-2011, 08:20 AM   #19
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Quote:
Originally Posted by elm3 View Post
That is normal, the sound is coming from the headers.
From headers? Why it makes the sound like leaking exhaust
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