Hi i recently bought a supercharged vr on the cheap and am having problems with it, Is a Z Engeneering on with previous rr of 286hp at storm. Its really not performing as it should ive checked and its running approx 10psi of boost. However is very down on power still Its flat right the way through th rev range and if i am honest doesnt feel that much faster than my standard car, It also has a load screatching noise from 4k onwards as if the belts a slipping, However this is not th case as its got toothed belts. Im really lost on this one hope some one may be able to give me some advice. Thanks