First off, a set of Gears... 3.73's if you've got a 5-speed, 4.10's for an
automatic. After that, a cold air kit, a set of underdrive pullies, and a
short-throw shifter for that 5-speed. Nitrous is cheaper than
super/turbocharging, but it has it's limits.
I sell Steeda parts, so I can get them to you for cheaper than most places.
You have to realize, though, that there are two different ways you can go with
perfomance in a Mustang. Drag Racing, or Autocrossing. If you want one, you
can't be trerribly good at the other because one is designed for a straight
line, the other is for the twisties. I'm guessing that you are just wanting a
streetable car with some power, so you might want to go with a set-up like the
Steeda G-Trac suspension, which will give you cornering ability without
compromising ride quality. From there, power is power. Here's the address for
Steeda, so you can see some of thier stuff.

www.steeda.com

You can also go to www.mustangworld.com, www.stangparts.com, just look around.
Most of the Mustang Mags (MM&FF; 5.0 and Super Fords) have all kinds of stuff.

Later on,

Matt Havash
2002 Serialized Steeda GT