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06-15-2010, 02:11 PM | #1 |
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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.
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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, 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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07-13-2011, 06:54 PM | #13 |
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07-16-2011, 08:48 PM | #16 | |
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07-17-2011, 07:08 AM | #17 |
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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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