What size throttle body would work best for my set up. I have an 01 GT with a Magnaflow magnapack cat back, bbk lt's, catted short H pipe, K&n FIPK kit. With this set up what size throttle body would give me the best results. I also plan on doing the plenum at the same time. And also which headers give you the best gains LT's or shorties. I have the LT's but just wondering what sort of difference their is .