That's not 3-5 hp gain at peak hp, that's a peak gain of 3-5 hp; that's the highest gain seen anywhere in the rev range. I would agree that every couple of hp adds up, but for the money and the amount of time it takes to put headers on a newer stang there are a ton of more effective mods you can do.
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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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