CAI, FWI, exh., no smaller than a 3.5" puley to start, and def. some tuning…and all the other stuff that was mentioned.
Oh and save for a trans. They dont like burnouts, abuse, or an engine making moderate powa. Some people have yet to find that out the hard way. 
All these people modding GP’s now, hell, I minus whalel get a LS1 car. 