How many XI's out there with 500 WHP/TQ.?
I'm curious how many successful XI's are out there with 500 WHP/TQ.?
My car is 6at, fbo and I'm installing NX express kit (35-50 shot) this weekend.. If I upgraded the valve body what would be the next weak link in the drivetrain?
F10 535D XDrive (USA)