Hey Mineral, I bought the JET performance module for my 98 GT a couple of months ago. I remember choosing between a "stage 1" and "stage 2" chip. I wound up getting the "stage 2" chip, which is burned for vehicles with a high flowing exhaust system.
Taking out the PCM on my car was not too difficult. I can give you simple step by step instructions for the installation if you want.
After driving around with the chip for a few hundred miles, I removed it. Given the limited mods on both of our cars, I don't believe there is a significant gain to be found in PCM tuning.
The first thing you should do, if you haven't already, is get a $15 speedometer calibrator from steeda.com for your gear swap. Your odometer will thank you.
You could also try a RAM-AIR kit that I picked up from Home Depot, I can get you my design if you e-mail me. I backprobed my MAF sensor and IAT sensor before and after the install, and discovered excellent changes in flow and temperature. The result has been great, the car picks up much better and the cost of parts was a little over $15.
Really though, I think the results that you are looking for is in a power adder. NO2 is the cheapest, but from what I hear, beware of the unsafe tune.
Find out as much as you can about mustang performance shops in your area, and hang out there as much as possible. Ask other mustang owners what they have in their cars. No one will mind, most mustang owners I run into love to talk about their mods - that's why we're all here right?
Hopes this helps...
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