rpm is saturating the intake when you have N20 . You have N20 wet shot that has both fuel and N20 metered proportion for proper mixture regardless of engine rpm. For comparison, my stock turbo with N20 60 shot dry made these torque numbers 200ft.lbs @ 2000 rpm, 350ft.lbs @2700, 400 ft.lbs @ 3000 rpm, over 500 ft. lbs from 3500-4600 rpm, 470 ft lbs @ 5000 rpm before it shut off automatically.