Ok people, im seriously fed up with people that take TF&TF so seriously! It was a movie. Everything in Hollywood is fake. I told a guy at my work that I had just got a bottle and he was like "OMG!? have you seen how he blew up his car in the fast and the furious? That is going to happen to you too!" Everyone freaks out when i tell them i want nitrous. They are all like "Dude you are going to blow your car up!" Im just like "You can BLOW me;)" Anyways...Start with a 50 shot then slowly move up to 60 and 75 shot. If you go over you might need more fuel, depending on what type of kit you get. Also you will need to rebuild if you go over 75. Dont go over 75 but keep it safe and stay around 60, that is my best advice.