Bottle pressure was a little low if you read the nx booklet it will tell you that the best pressure is 1050 and thing below will run rich and anything above with run lean. Well I look at it like this Nx rates theres at the wheels as other companies rate theres at the flywheel. If you compare Nx kits to the others you will see for the same shot they use bigger nitrous and fuel jets. The 150 shot I have on my car I did some comparing to other kits which would be the same as a 175 shot rated at the flywheel.
Correct me if I'm wrong but wouldn't HP increase be the same at the flywheel as it would be at the wheels? If you gain 100 hp at the flywheel, its still going to be 100 gain at the wheels, you just loose that ~30 through the drivetrain, thats what is constant.
Ex: N/A 300 FWHP, 270 RWHP ; nitrous 400 FWHP, 370 RWHP. Both numbers see a 100 HP gain, both RWHP see a 30 HP drop from drivetrain losses (assuming peak numbers occur at the same RPM).