do it right you would have to get greg's manifolds to be on the safe side. Which puts you at 6600 for td05+gregs manifolds. There is no winning here :/ I will go with his manifolds prolly in the winter when i build the engine as well. Its alot of money to go from stage 3 to this and i am not rich so i do what i can when i can. This should be a nice upgrade for now i think.