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I think it comes down to two main questions: 1) What temps are you tracking in, and 2) What ELSE you do with your car. The only two events I ran the Sp500s in were mild and cool days, and 16psi (~425RWHP) was a blast. The boost come on hard though, so I had a lot more throttle modulation to handle than what I'll go into next with the Sp700s. Cranked all the way up with tuning, timing, etc., they max out at 500RWHP (I made 489RWHP), and 425ish on pump... The Sp700s at 11psi made 450RWHP and the power is quite linear and controllable. It's just what I've always wanted - a 450RWHP "NA" (after driving the 350ZR at the track, the only thing I could have used was another 100RWHP!). That boost is barely working them also, so my temps stayed low even in the Tejas heat. I don't know if I could drive it at 16psi (~510RWHP) on the track, and didn't try in TX... I've really enjoyed the settings I've driven so far (11psi, 16psi, and a few runs at 19psi). It also rocked at the autox, although that was a relatively fast autox compared to what I'm used to. The spool is comparable to a typical Sp500 car, but keep in mind I have a 9:1 motor, gobs of head work, MSP manis, etc., to help spool... I hope that helps? SS
____________________________________________________ 2-19... always remember 2-19... 
You keep driving Laguna Seca with a video game - I'll drive the corkscrew in my 12 year old Z.
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