What do these engines provide stock at the crank? Skip plenum spacers - those don't do anything but take money and add weight on fuel injected engines - they only helped with carbed or single-point fuel injection to add time/space to mix the fuel and air. Be careful with your intake mods. If you increase size of tubes, plenum, and TB much than you will reduce low end torque and, unless you change cam profiles, will add little to the top end. Infact, most of your mods will do little without tuned cams. The ECU tune will be the best bang for your buck even if you do no other mods. Been there, done that.Sammitdam wrote:Not looking at forced. Currently have; Y-pipe, intake, exhaust.....about to purchase; bigger manifold, throttle body, plenum spacers, headers, hood modification, tune. It's torque I really have to watch, CVTs don't like torque.