some skunk 2 cams with skunk 2 valve springs/retainers and some machine head work, along with a hondata s300 tuned, you will put out some impressive numbers. But of course do I/H/E too, and a good exhuast, not a muffler with some random ass piping. Greddy, HKS, Tanabe, those kind are the best of the best exhausts.