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I am actually wondering if the cats could be the insanely annoying rattle I have been unable to track down. Sounds like two aluminum washers rattling against each other at 3-3.3k rpms, low to mid throttle use. What kind of rattle sound did yours make Mad Hatter?
To be honest, with the rear seats out etc, I would not be able to hear anything like that at +3000rpm. I only noted the rattle when I took off the xpipe to get the tranny out.
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