I've never heard this before with all the exhaust configurations I've run so it must be the sport cats. Well, I put her up on ramps before I left today so that I can do some more work. If I end up with them off I'll sell them too.
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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