Performance Modifications for the NG900 / Old 9-3
ok I am really new to tuning a car, I am kind of confused, Example, for every time I modify something on the car... eg. turbo, intercooler, exaust etc, do I have to get a tune done to my ECU?
What I have going and my delima is that my 95 Saab 900 turbo has 3" down pipe, no catalitic converter...