Just finished installing a Magnacharger, 9.5psi pulley, colder plugs, KB boost a pump and a custom DTP dyno-tune. Only other mods to the car are a Magnaflow catback exhaust. Final numbers were 548rwhp and 565rwtq. Here's a link to video: http://www.youtube.com/watch?v=1K8fmD80qrc
We have several cars with stock motors running 9-9.5psi for years now. Tuning is DEFINITELY your friend.
Aaaaarrrrgggghhhh, I have just managed to convince myself to stay at 6 psi too keep the car from blowing up, you just changed that and now I have to go to 8, well, if all goes horribly wrong I´ll just blame Ralph... Fredrik:whistle: