Originally Posted by PencilGeek
Simple answer: Horsepower. Since horsepower is a function of torque and RPM, if you modified your motor, cam, intake, or maybe even exhaust, it's very likely your car will not reach maxHP until a higher RPM.
Well sure, but that requires much more work than just the ECU, right? So that when they offer to remove the rev limiter on "just the ECU" w/o anything else beind done, I worry. Unless of course they can affect all these things by just reprogramming, which seems a bit far fetched to me.