a Mike Smith built motor at 535RWHP. He never races because he has so much invested. He's afraid that he'll wreck it or blow it up. When he does drive it, he keeps the boost turned down to around 15. You never know--some stock Zs have been hard or neglected. You might find a low mileage Z owned by someone that does not know much about turbos. They may have changed oil every 7500 miles thinking it was OK. I'm not stock, and my car is not raced or abused.