This is the letter I received in response to my inquiry regarding the warranty coverage of Ralliart parts installed by dealer. Ralliart is not mentioned once in the letter. Looks like a cookie cutter letter that probably also is sent to people who MMNA is denying warranty repair.

Quote:

MMNA can only guarantee performance of a vehicle if the original equipment is kept intact. Modifications to the vehicle changes the dynamics of the vehicle's engine performance and emissions system as well as other components on the car depending on the changes made. As such, the warranty specifically excludes coverage for vehicles that are altered or modified. MMNA does not condone or authorize any specific aftermarket component, accessory item or vehicle modification.

Our general policy is that any vehicle problems (such as, but not limited to), vehicle component failures, premature wear, performance issues, electrical problems or other conditions caused by any alternations, modifications, or enhancements, will not be covered by the New Vehicle Limited Warranty. Please refer to your Owner's Warranty and Maintenance Manual.