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I had a rattle from my exhaust area only after the car warmed up. Turned out to be a loose clamp that connected a U-tube from my cat to the muffler. The U-tube would move slightly when I shook it. Tightened it up, and no more rattle.
When the car is cold, grab onto every single exhaust part and shake it to see if anything is loose. That's how I finally found out my problem.
It could be a bad cat converter, but not as likely IMO, because you would also probably get a CEL light if that were the case.
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Current: 07 Carrera S Cab in Midnight Blue
Previous: 01 Boxster in Arctic Silver, 86 944 in Guards Red
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