GM now uses the Dtech PMD as a replacement for the factory installed PMD. We are going to give a one year warranty on the Dtech PMD when you buy the Extension cable and heat sink combo for $338.99. We will extend the warranty to 7 years. We give you the option, you get the 7 year warranty when you buy the Dtech PMD, extension cable and heat sink combo for $549.00  You get the same exact parts but get to choose your warranty.