well, first you need to find out the weight of NOS then divide the vehicle's gross cargo weight by the weight of a single kit, this will give you the absolute maximum amount of NOS you can put in the car, however, if you intend to be in the car at the same time, you will need to subtract enough NOS to compensate for your weight. You will also need to compute the volume of NOS and the maximum volume you can use in the car for the placement of NOS, space may or may not be adequate for the maximum computed NOS avaliable by weight, if you have extra room, then good you could even put an ebay chip on it. However if internal vehicle volume is not enough for the maximum computed NOS, you could just bolt it to the roof.
