it hooks up to your catalytic converter so that when you push the button it mixes with your exhuast fumes and creates an explosion. so it shoots the air out faster pushing ur car. depending on wheather your running an obx or tezno muffler or just tip depends on how much "shot" you should use. tips dont hold up well cause the bolts cant handle the explosion. u have to weld a tenzo muffler to ur factory piping to have it work the best. take it to the dealership for best installation. especially if its under warranty, cause then the dealership is responsible for any damage the NOS might do. good luck