Unfortunately, I am experiencing the same sound Arnold K was having even wiith the new pipes. Started to occur after 200 miles. Sounds like a ball bouncing around in a tin can. It goes away after about 30 seconds on a cold start but can still be heard while driving. Also, a SES light popped up around that time with a P2A03. Will have to take it back to Amp to have them look at it.
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