my 00 s4 is only pushing about 5 psi it never spikes even to 8 psi it climbs to 6 drops to 5psi and holdsi took car to audi dealer thay said its not in limp mode i have done a pressure test and its not leaking any boost and there is CEL on soooo im not sure what to do anyone got a idea that i can also check? ps i also took th n75 valve off and it still wont boost over 5 and i replaced the n75 valve anyway tho...