exhaust break-in, myth or reality

chanceparker · 10-06-2008, 12:17 PM

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...

Thanks

hotrod2448 · 10-06-2008, 12:26 PM

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.

MikeM5 · 10-06-2008, 12:32 PM

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?

BoostedBMW · 10-06-2008, 01:16 PM

In my experience all of my exhausts have gotten slightly deeper and louder over time, and they usually drone more if anything, not less.

Sniz · 10-06-2008, 02:49 PM

Quote:

Originally Posted by BoostedBMW

In my experience all of my exhausts have gotten slightly deeper and louder over time, and they usually drone more if anything, not less.

+1

down4it · 10-06-2008, 02:51 PM

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...

chanceparker · 10-06-2008, 04:47 PM

OK, thanks everyone. I'll guess I'll wait to see what happens. Will post some clips after I get some miles accumulated.

emjei · 10-06-2008, 09:51 PM

If you dont like the drone write borla they have a fix for it

rsjames · 10-07-2008, 06:59 PM

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.

dadasracecar · 10-07-2008, 08:36 PM

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.

10-06-2008, 12:17 PM	#1
chanceparker First Lieutenant 54 Rep 359 Posts Drives: 2018 M240i Join Date: Mar 2008 Location: Scottsdale iTrader: (9) Garage List 2007 E90 335i [10.00]	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... Thanks
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10-06-2008, 12:26 PM	#2
hotrod2448 grand poobah 257 Rep 2,253 Posts Drives: F80 M3, F10 535i Join Date: Dec 2006 Location: Charlotte, NC iTrader: (0) Garage List 2011 335d [0.00]	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, 12:32 PM	#3
MikeM5 Future Classic 265 Rep 995 Posts Drives: BMW / Porsche Join Date: Apr 2007 Location: Chicago, IL iTrader: (6)	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? __________________ FUTURE CLASSIC \| \| Follow Us on Instagram Melbourne E90 M3 \| Jet Black E46 M3 \| Techno E36 M3 \| 997.2 C2S \| 958 Cayenne GTS
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10-06-2008, 01:16 PM	#4
BoostedBMW Moderator 134 Rep 6,775 Posts Drives: TiAg E92 335 Join Date: Oct 2006 Location: Raleigh, NC iTrader: (14) Garage List 2003 S2000 [0.00]	In my experience all of my exhausts have gotten slightly deeper and louder over time, and they usually drone more if anything, not less. __________________ -Michael. Berlina Black S2000 CR is now in the garage l 19" Rial Daytona Race l KW V2 l Eisenhaus Race Exhaust l
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10-06-2008, 02:51 PM	#6
down4it Banned 64 Rep 1,743 Posts Drives: E92 335i Join Date: Jul 2007 Location: SoCal iTrader: (3)	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, 04:47 PM	#7
chanceparker First Lieutenant 54 Rep 359 Posts Drives: 2018 M240i Join Date: Mar 2008 Location: Scottsdale iTrader: (9) Garage List 2007 E90 335i [10.00]	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, 09:51 PM	#8
emjei Captain 80 Rep 821 Posts Drives: 08 BMW M3 Coupe Join Date: Apr 2007 Location: Puerto Rico USA iTrader: (3)	If you dont like the drone write borla they have a fix for it
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10-07-2008, 06:59 PM	#9
rsjames Private First Class 2 Rep 122 Posts Drives: 07 335i Montego Blue Join Date: Mar 2007 Location: Orange County, Calif. iTrader: (0)	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, 08:36 PM	#10
dadasracecar Banned 19 Rep 268 Posts Drives: '06 Mazdaspeed6 Join Date: Jan 2008 Location: DC iTrader: (0)	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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