I'd want to get around 200 hp out of a 6.2 without getting a turbo or spending a lot of money. Getting better mileage and more torque would also be great. Anyway, here is what I had in mind: J code intake mainfold Building a snorkle (not for power) Building dual 3 inch exhaust pipes with a balance pipe K&N filter Advancing (?) the injectors Anyother suggestion? How many HP would I gain? MPG? Torque? thx chevy4x4 P.S. Could someone (BlueBlazer maybe) explain the J code intake manifolds a bit more.