Help 90 Gt - Preformance Chip?

I need some info on a CPU chip upgrade for a 90 GT. This is one upgrade I have never done before, I am used to older cars. I want to know if a chip will make a differance on my car. I understang Diablo is the one to go with. But which diablop chip, I understand they make more then one chip, and where should is a good place to order one? Also is this comething I can install myself?

What else do you have done to your car? Is it a 5-speed or Auto?

If it's a 5-speed you have an A9L computer, which is a very good one for performance. I'd spend the money elsewhere, personally.

If you really want to change your computer settings, get a good EEC tuner such as the TwEECer....

5 spd, 3:73, exhaust, pulleys, CAI... Let me know what you think, If you guys agree the CPU I got it OK I'll stick with it.