On a mildly modified street car there is only a few hp difference between running an h- or x-pipe with hi-flow cats vs. no cats, though both offer good gains over the choked up stock setup with 6 cats. On a racecar the difference is more noticeable. The main difference is in the sound and emissions legality.
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Strike down the unroadworthy!
2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more
'94 Rio Red Cobra: All the bolt-ons, 3.73s
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