Wouldn't have a clue what the rattle sounds like, but I must say that if anything does get loose and make its way closer to the engine you'll be saying "ohhhh S$%T!" - I know I did
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King Spring Lows, TWM short shifter, split eardrums, blah blah blah and a little voice saying "I wish I had a turbo"
Updated 2007-03-19: Readers Rides Finally upgraded from the stock headunit