I used these guys to tune the pcm for my lt1 engine after doing some mods. Was able to talk to brian, the actual tuner, on the phone and tell him my needs as my lt1 is an engine swap. Price was 200 bucks, they had my computer to me quickly, and it has worked flawlessly. Also, could tell a hude diffrence in the way the car ran from the stock ecm program. If you need a tune, look these guys up! on the net!