A lot of people (myself included) have not been able to identify in MMA the diference in replacement parts, and performance parts. However, I did find this:
"....Under the act, aftermarket equipment that improves performance does not automatically void a vehicle manufacturer's original warranty, unless the warranty clearly states the addition of aftermarket equipment automatically voids your vehicle's warranty, or if it can be proven that the aftermarket device is the direct cause of the failure...."
Also, I DO NOT see anywhere in the warranty that says it will be void for using aftermarket, performance enhancing devices.
http://www.dummies.com/how-to/conten...ty-intact.html