Got a 07 2500hd 4x4 with the 6.0 and 6 speed auto. The only bolt on I have now is the gmpp intake. Besides an exhaust and tune what other bolt on's would you guys recommend? I'm tryin to help gas mileage, add a few more horses, and not kill the warranty. Also does anyone know what these trucks are making at the wheels stock?

 

round 275-300ish..

I have ONE bolt on....it can come off for the warranty

 

put on some headers i got short tube and pick up a couple tenght an they want void warranty like lt"s