Magnuson Moss Warranty Act, look it up. A dealership should have to prove the part you have installed caused the failure. Of course if it's something obvious like you installed a cam and your lifters collapsed you are out of luck. For smaller items: intake, exhaust, headers, pulleys, tune, etc. In most cases you should be ok. Make friends with someone in the service department at a local dealership. Some dealerships work with you, others will stick it to you for anything.

 

Cool. Anyone in the southwest MO area that knows of a dealer that is good? I am willing to drive a decent distance if the dealer is cool with warranty stuff. I am going to order a truck so there won't be much discount from dealer to dealer.