Do a search on corral.net. There's been a ton of discussion on the topic on there. On a street car the difference is mostly in sound. The H tends to make a bit more power down low but not as much up top, but the difference is only a couple horsepower on a mild motor.
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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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