This is kinda late but here are vids and the dyno sheet from when I dynoed my truck at NP last month. The sheet is from the run with cut-out open and spray...although I only picked up about 20hp due to low bottle pressure. Thanks to David for shooting the video! And as always, thanks to the folks at NP...!
lsxvideo - robs truck running with cutout closed and boost only
lsxvideo - rutroes second dyno with cutout open no nitrous
lsxvideo - rutroe dynoing with open cutout and 75shot