just had my rwd drive saph rolling roaded on sat! was boosting 17 psi fine on the the rollers which produced 285 bhp@ the flywheel and 237@ the wheels! on the road its peaking 20 and holding 19psi due to better air flow as it only had little fans on the rollers! the mixture has been checked twice and theres is no pinking,i'm very impressed by the difference a set up can make! as all the previouse owner had done was thro in a chip a whack the boost up!