to me.... the cheapest max HP-builder you can get is nitrous. you can get a kit for the truck that'll get ya 75, 100, or 150 HP gain. it's from NOS, and it'll run ya roughly $500, if you want a full tank. the shaft should be able to hold another 200 - 300 HP, shouldn't it, Brian? let's help out the new guys! welcome to the site!