an upgrade on the computer for the car
i just installed a thrasher cold air intake
im sry if im not being specific about this, im only 16 and i am just starting to learn all this.
They currently don't have a production '97.5 Regal PCM and probably never will as there is no market for them. But if you can get to the Chicago, Detroit, or Toronto area you can get a custom tune done to your car. That is what I had to do and boy am I happy with the results.