I have to agree with SR20DET. Lose the cat and go with 3 inch pipe. My friend had a 98 prelude turbo with greddy exhaust and he changed it out for custom 3 inch piping from the downpipe (no cat) to the muffler (apex dunk) and he gained about 15 hp on the dyno. This was at 10psi.

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TampaSol
94 delSol VTEC
00 Civic Si
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