Mustang GT computer VS Cobra computer

With regards to the computer in the 94-95 mustang. Is there a difference between the computer in the GT and the Cobra? Ive have also heard talk of a A9L swap. What is the advantage of that and how involved is it. My goal is to improve my A/F curve. Any help would be appreciated.

Althought the Cobra computer at first is better and designed around 24lbs injectors it's A/F curve is actually rather conservative. Most people when switching use the A9L. But an A9L is nothing special in of itself. It is just the most common so the most custom programming has been done on it. So if switching is all in a quest for a better A/F curve I would get your stock computer cusom programmed for optimum A/F curve.

yeah, get a custom burned chip.