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      12-28-2012, 12:01 AM   #9
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M3amigos's Avatar
Drives: 2008 Jerez Black E93 6MT
Join Date: Nov 2012
Location: Orlando, FL

Posts: 255
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I had a similar experience on my previous car after I removed the cats, I had a metallic rattling sound/vibration at low rpm, but I couldn't find any leaks or loose shields, see video below. It actually went away after a little while, I think it could be just the resonance/harmonics of the new piping close to the engine, mine seemed to go away after a few months after breaking it in.