Originally Posted by DrBacon

I think the drop in boost at high rpms is from the supercharger side belt slipping. I ran my hand under under the belts and on serpentine side it's clean, but once I touch that supercharger side belt my hand is covered in black dust which I assume isn't normal and due to it slipping. I can tighten that tensioner, which looks like a real pain in the *** to get to while still in the car, however if it's already making 13psi with belt slip I really don't want to know what it will do once it's tightened. Boost gauge arrives next week and I should be able to verify with that the MAP sensor readings just to make sure. Also new clutch is going in next week as well