BaileyT

1 Alibi 2

Welcome to the forum.
Have an end goal for your car, & a budget, purchase items that work toward your end goal.
Buy once & done, there is no money in used parts !!
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BaileyT

1 Alibi 2

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That doesn't change anything..
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99GTvert

I wouldn't worry about bigger injectors unless you were adding forced induction (super/turbo charger).

Exhaust will be more for sound than noticeable, seat-of-the-pants gains.

New rear end ring and pinion gears will surely give you a noticeable SOTP feel, though you may see a drop in fuel economy at highway speeds because those raise the engine rpm's.

A cold air intake with a tune could actually improve SOTP feel as well, or fuel economy if you still drive gentle.

I'm going to move this to the V6 section. Try browsing our forum for some ideas. If you're just looking to tinker with the car a little bit by doing the work yourself and learning more as you go, then check out some other threads on how some bolts on's work and what effect they had. If you have a target horsepower goal that's something like adding 50% more power then you might find your options are limited to a super/turbo charger.

NYstang

Well, depends on your wants. For basics, gears and a tune. Springs help the looks and the handling, as well as a 94-04 GT/Cobra rear swaybar/. Short throw shifter if it is a stickshift.