The most effective 1/4 mile performance mods you can do is to get gears (at least 3.73s), X-pipe, pulleys, timing adjuster, and suspension. Throttle bodies, cat-back system, and cold air are not worth the $$ for the marginal gains, if any, you would see. IMHO.
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1999 GT - Laser Red
K&N, Steeda pulleys, Steeda strut tower brace & Tri-ax
(Upcoming mods: subframes (bought), Bassani X (next), & FMS 3.73s
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