F.Y.I. 02 with rockers, tubes, filters, 708 cam, Belangers headers, high flow cats, and 3" catback, and tune = 461 R.W.H.P. and 499 rwtq on a 100 deg day in so cal. Hope this helps with what you would need to do to get the h.p. with bolt ons. Also still passes CA sniffer emmissions :D