It's just that I ran the higher 18psi boost with the NOS when I had some race gas in the tank. With pump gas, I might drop down to 15 psi boost with NOS to be safe. I actually RARELY run the NOS...the novelty wears off some, and its expensive and a pain in the ass to keep refilling. The kick is maybe equivalent to running 4-6 lbs more boost, but it comes on instantly when you floor it...what lag ?lol