Mate had it on his GPZ1100 years ago, cost him around £350 about 15 years ago and that was a simple system with only 1 jet per inlet and activation on full throttle stop rather than a button, got about 5 bursts per bottle, blow his engine eventually, i rode it and it aint like the films where it moves you at warp speed at the touch of a button, things may have moved on in the world of Nos but unless your seriously competin in drag racing and have your engine uprated and regularly stripped i cant see the point, you cant use it on the twisties and thats the fun part of owning an aprilia, my opinion is save ya money mate :thumbup:thumbup