260hp, 302 lb-ft stock. 84LX89GT is right on as far as the 1/4 times and getting gears and a shifter. Cold air is worth nothing but looks. Lots of bolt-ons offer decent gains.
The '03 stang does not have a T45, so there are no worries with the tranny. I believe the newer ones have a Tremec TR3650 which shifts very nicely like the T45 but is tougher.
As for the flexing chassis, subframe connectors are cheap.
Your friend should take a look at the new Mach I's  .
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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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