Don't modify your new Mustang - Ford said so

[DBL NKL]

It's tough trying to get away with any mods these days, and rightfully so I would think. I have an 09 Duramax with aftermarket exhaust, air filter and a tuner onboard. Both of the major truck dealerships here have seen the truck since and both were clear right up front that any power train warranty is dead in the water.

Been the that way with Harley's for a long time and I basically take a new Harley, change out the motor and say good bye to any warranty right from brand new. Like was said above...if you're man enough to be able to afford and perform modifications, then be man enough to eat it when you break something. Simple as that!