I have a 2000 Stage 3(untuned) Audi S4. I recently just changed my clutch on the car. While going though that my MAF decided to take a ****. I have the upgrade Hitachi MAF so I have to order one. As of now I'm running with no MAF and I'm aware of what or more or less how it will run without one. When I went to drive my car today I noticed my boost gauge stayed at zero. When I went to drive the turbos didnt spool like usual but I hear moy BOV when over 4500 rpm....Someone told me it was my N75 stuck open...but I just wanna hear some feedback before I randomly buy parts I dont need.