A Mustang exhaust consists of headers, a crossover pipe (X- or H-, with or w/o cats), and a catback system that consists of the mufflers and tailpipes. The catback is mostly for sound; don't expect to gain more than a couple horsepower by changing it out. As for the crossover, an X-pipe gives slightly more top end horsepower and a little less midrange torque than an H-pipe. The H-pipe tends to have the musclecar sound while the X- sounds a little more like an exotic at high rpms.
I have a Magnflow stainless X-pipe with cats on my car and a Magnapack catback and it sounds great.
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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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