My brother has an '03 Lightning that is currently at 400 rwhp. He is looking to take it to 450 rwhp, where he will hold off and start saving fr a new rotating assembly. His mods right now consist of a 6# lower, C&L air intake, C&L 95mm MAF, Accufab TB, C&L upper plenum, Accel coils, NGK TR6's, and a custom SCT dyno tune. What do you guys recommend he do to get the extra 50 rwhp?