If you have 317hp, please let me know how Roush claims to have done in order to achieve that. Stock GTs are 260hp. The only performance upgrade I see is the cat-back system, which someone already pointed out may add 5hp. Unless there are different heads or some other combo involving MAM, throttle body, and h/x pipe I don't know they would do it.
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1999 GT - Laser Red
K&N, Steeda pulleys, & Steeda strut tower brace
(Upcoming mods: subframes (bought), Bassani X, & FMS 3.73s
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