I have a 94 SC 5speed and it does hit 15 pounds of boost and it is stock with a stock pulley!! The 94, 95 SC's have a better supercharger, it is more efficient and can achieve more boost with a larger pulley than the earlier models with the smaller pulley. Almost all 94-95's are between 13-15 pounds. I would say that your car should be around 12 psi, you probably have a vac. leak or the tube to the gauge is leaking.