My car is a 1993 Cobra and in excellent condition. I recently installed a KB 2.1 Flowzilla and It is at a dyno shop getting a tune. Originally there was a problem with the Kenne Bell making any boost at all. The car dynoed at 277hp with zero boost. The shop moved around some vaccum lines and it made 2lbs of boost and gained a few HP. Now the shop says it is making 8lbs of boost but is still making just under 300HP. The pulley is a 3" pulley which is the 10lb pulley. Can anyone with experience with this please offer a suggestion as to why the car isn't making power?