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Going way back there were other reports of power loss with aftermarket exhaust. I admit I went down that road till I put the stock back in other that swapping the muffler for a factory S one.
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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