off the top of my head, the first thing you should probably do to your truck would be to add a air intake and some bad azz sounding exhausts. Since i have spent countless numbers of hours reading up on diesels and mods, and final made my decision on my truck, i cant really tell you whats on the market today for gassers. Im pretty sure they make a power programmer for your truck where you plug into the computer and can play with rev limiter, shift points, speed limiter and other specs with the motor. If youve got questions on diesel mods i could help you, but maybe somebody with a suped up gasser could resond.
"Lifes a garden, dig it"