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I'm going through the same thing with my 99. I put high flow cats on and it sounds exactly as you described till it gets to full temp, then it isn't as bad. I've pretty much determined that I need to go back to stock but I need a replacement OEM cat first as one had the o2 threads destroied.
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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