the whole holdin it on for 13 second stuff doesn't really have much to do w/this system...it injects at wot so i know it shuts off in a few seconds so there will be no harm caused...you can buy a few add on's for the kit to make it run better such as a purge kit remote bottle opener and the bottle heater to go w/gauges and so on...the 35 50 and 75 is the size of the fuel jet i put on the car...the bigger the hole in the jet the more nitrous and fuel it will get which determines the amount of boost i will recieve
