I was one of the first people to use it. Your main problem is you got belt slip..thats why your only seeing about 7psi...you should see more like 9/10psi. Use a 112.5inch gatorback with the idler pulley and you'll be good to go. I got increased hp and very very noticable better throttle response. Every single saleen with a blower should have this mod, stock or modified