Depends on what you are going for. You could get an Intake (~$300) / O-X/H (~$300), Axle back (~$400), and tune ($500-700) for that kind of money and make significant power gains.
If you are looking to improve the stance / looks of the vehicle you can do it via suspension depending on springs (~$250), shocks (~400-800, this depends on adjustable / non), panhard (~150). You could add other things to suspension mod which will help with traction / ride like UCA, LCAs, Relocation Brackets, Sway Bars, CC plates / Mounts. You could make a very large dent in the suspension and make serious improvments.
Wheels depends widely. $2500 would get you about what I have or you could go with many different options from like AM, Latemodel, who sell the cheap combos.
Appearance mods would vary greatly, kinda depends on what you are looking for.
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Airaid CAI | Borla S-Type Catback | Amsoil 10w30 and MTG Trans. Fluid
382hp 387ft/lb | 1/4: 12.9 @ 112mph
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