It's not perfect because anything that increases the power of the car could be argued fairly convincingly to have contributed to the failure of another driveline component, but if you increase the power on the car, your windshield washers and trunk opener (as examples) are still covered as before.
Magnuson-Moss Warranty Act has been ruled to preserve the warranty for unrelated failures on modified vehicles.
https://www.sema.org/sema-enews/2011/01/ftc-validates-right-....
It's not perfect because anything that increases the power of the car could be argued fairly convincingly to have contributed to the failure of another driveline component, but if you increase the power on the car, your windshield washers and trunk opener (as examples) are still covered as before.