Anyone wondering what inside a stock muffler looks like? (pics inside)
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01-07-2013, 01:39 PM
BimmerPost Supporting Vendor
Drives: C6 Z06, 09 335i, 10 335xi
Join Date: Dec 2008
Looks like a perforated core and fiberglass or something. That's why most cat back's don't add too much power, it's already a pretty good exhaust from the factory.
Without that packing it might sound like a tin can though. Have you driven it?
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