This isn't a rattle it is a rasp. It is hard to describe but I've had rattles before and this is an exhaust noise. I've tried two different mufflers in case that was the issue but it wasn't. The noise only was present after I put the cats on and is most noticable with the stock muffler. I could just get the Maxspeed muffler but I really like having no drone. 
Chris
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1999 986 2.5L, Stock Exhaust (S muffler), EVO Intake, 18" Stock rims (17" during winter), IMS Upgrade, 150k+ miles and counting!
87 944S brought back to life
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