I picked up my Herrod Stealth unit on a rainy day. Loaded the 10psi map and on the way home I could resist, at 70 km/hr entering on the freeway ramp, stabbed the throttle, wheelspin - traction control gave up and tunned itself off boost gauge pegged past 10psi and much more turbo noise, traction gained and then sit back and hold on. WOW !! By the way turning the engine off and on again resets traction control. With dry roads it was like driving another car, with a mate we tried the different settings. Once you have used the 10psi setting the factory setting is quite tame, 8psi is good 10psi is fun! He has a modded SS ute and to quote him - the SS has no where near the pull. My car has always made good power. I drove it hard from the begining and always run Optimax. I had no problems with the 10 psi map and don't see any reason to use anything else. Definatley eats WRX and HSV for breakfast, don't even bother with the SS's anymore. To answer Steve, the turbo noise is considerably louder, but thank god the bov doesn't sound like a ricey rex. The only problem and not a bad problem to have is that I used to get about 6 seconds of fun (0-100) now I get much less time to enjoy it.....