i just brought a 90 notch back wit a paxton sn 2000 SC on it. The Sc has some miles on it but are they any good? I tryed to research it but i couldnt find much. I was readin that you can get 8psi on it but is that the max?? Wut kind of parts do i need to make it have more boost and what are the specs on it ?? How do i know if its even good anymore thanks??