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
My Series 1 reaches 7-8 lbs with the stock pulley. I have been thinking about getting one myself if for anything, to keep the belt from potential contact with the upper radiator hose.
I have one sitting in my trunk. I will be installing it when I get my tune. I will let you guys know how it works out. The one thing I know is that he is a good guy, and is willing to answer ANY questions you might have. He knows his Saleens. Also, the product is first rate.
you have belt slip....buy a 112inch goodyear gatorback belt...and you'll see another lbs or 2. With the pulley you'll probably see another pound, but the big gain is gonna be maintaining boost instead of it falling off up top with belt slip