If you just want to change the sound of the car you can either have mufflers welded in or change the catback. This will only net you a couple of horsepower; nothing noticeable. Changing the factory crossover pipe to an aftermarket H- or X-pipe will give you a more noticeable gain. If you get one without cats, it will make the car alot louder but it will not be emissions legal.
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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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