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      02-05-2013, 12:45 PM   #3
italyix
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Drives: '08 E90 M3
Join Date: Dec 2011
Location: Bay Area

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2-3k RPM sounds like normal resonance from the engine. Mine does the same thing, primary cat delete...then again, exhaust is the least of my vibration worries...solid bushings contribute the most hehe
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