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Before I switched to SSIs, I ran with a cat bypass pipe for years. If anything, the car felt faster without the cat. Can't speak to the dual pipe muffler though.
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John
Original owner '81 911SC blackmetallic coupe. Terbatrol, SSI, M+K Gen 4, SC+ cams, A/C delete, console delete, heater backdate, 7 & 8 x 16 Fuchs with polished rims, Turbo tie rods, tensioner update, Rennline engine mount bar, Mainely Custom sump plate, new top-end, corner balance.
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