4.10s, H or X pipe, mass air (in that order).
TB and cat-back are a waste of money as gains are minimal at best (1-2 hp). You can get the obligatory K&N (drop in). After the above recommended mods, you should consider a shifter and suspension mods.
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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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