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      12-20-2011, 12:07 AM   #52
AMPowerJ
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Drives: 2013 E92 M3
Join Date: Apr 2008
Location: Blythewood, SC

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Quote:
Originally Posted by Gearhead999s View Post
Mine does the same thing in the 4000 rpm range when the exhaust is hot.I think it is a normal thing as the exhaust note outside the car also changes so it is not an issue with mounting or loose parts in the exhaust itself.I really do like the different tones that this exhaust gives off at different RPM & temps.And I really like the fact that there are no annoying drones in normal day to day use and long distance highway driving.
+1

I love my Perf exhaust. Nothing is better than being on the track and hitting the gas to power though the turn and hearing that hollow, guttural roar as I pass through the 4K RPM range.
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