First off theres A complete tread on rustys on here you would get A lot more replies there from people who actually have the truck, second you cant get the best of both worlds,, meaning if you want higher top end you are gonna have to give A little on the bottom and vice versa, However if you change motors you can do both!!! Get my point? Good luck and read through the tread for rustys it will tell you all you need to know if not then ask and you'll have all the help you need.