Pullies that give 9 psi are also available, but he said it voids the warranty. Remember that the 350 has a pretty high compression ratio since it's NA. He mentioned that other 350Z's running that SC got about 360 rwhp, but I'm not sure if that was from the 7psi pulley or the 9 psi pulley. Sam from the meet mentioned that this 350Z walked away from him on the highway, so it must have pretty good power.