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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > exhaust break-in, myth or reality



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      10-06-2008, 11:17 AM   #1
chanceparker
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exhaust break-in, myth or reality

I've done a few searches on this but haven't found much.

Just installed a Borla exhaust (2nd gen) and notice a little more droning than I would like. I also noticed a few posts that claim that the exhaust sound will change during the "break-in" period of 2-3K miles.

Is this true? Should I expect any changes in sound quality or drone levels after the first 2-3K miles?

If so, what has to break-in exactly? It's a pipe and a muffler...

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      10-06-2008, 11:26 AM   #2
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The tone will change a little over time as the packing in the muffler breaks down a bit. It's not going to be huge difference though and I wouldn't expect it to help the droning.
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      10-06-2008, 11:32 AM   #3
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there is definitely a break-in period for exhausts! there was a definitely change in tone with both my eisenmann race (M3) and bastuck (335)...but i thought the changes were both for the better

do you have clips of the borla?
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      10-06-2008, 12:16 PM   #4
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In my experience all of my exhausts have gotten slightly deeper and louder over time, and they usually drone more if anything, not less.
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      10-06-2008, 01:49 PM   #5
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Quote:
Originally Posted by BoostedBMW View Post
In my experience all of my exhausts have gotten slightly deeper and louder over time, and they usually drone more if anything, not less.
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      10-06-2008, 01:51 PM   #6
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Every car i have owned i have had an exhaust and the sound always changes after a few weeks, more loud and deep every time...
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      10-06-2008, 03:47 PM   #7
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exhaust break-in

OK, thanks everyone. I'll guess I'll wait to see what happens. Will post some clips after I get some miles accumulated.
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      10-06-2008, 08:51 PM   #8
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If you dont like the drone write borla they have a fix for it
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      10-07-2008, 05:59 PM   #9
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Yes, the Borla will change tone after a month or two. In my case, as long as I keep it above 2500RPM, there's no drone.
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      10-07-2008, 07:36 PM   #10
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the cp-e exhaust gets more bass and a little quieter within the first 100 miles. I've had two of them. 2-3K miles is ridiculous.
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