And JWT charges $100 to reprogram your ecu if you upgraded your injectors or maf. Not a bad price to pay. Everytime you want to adjust your own fuel maps you gotta rent the dyno so you can make sure your car wont go boom...hmmm

Oh and another thing, my car is a street car, its not an all out drag car, a JWT ecu is more than enough for my application. YMMV