For you renting a V2 would probably be best if you want EFI Live. It's a simple process and whatever vendor you rent the V2 from can probably make you a package deal on exhaust.:drinkI understand EFI Live is the Bible as far as best, but do I really need to buy one or I have seen them on here where they will send you one and the switch and you program your truck and send it back? Whats the best way??