i have a 2003 single cab w/ the 4.2L. If i installed the underdrive pulley would it void my factory warranty? i definitely want to get more out of my truck but still need to have it reliable and under warranty. Any other suggestions on power mods would be appreciated. Oh i already have a flowmaster si/do 40 series. Thanks.

 

bueller.... bueller... just reposting seein if i get a hit