If you want to instead of buying the kit, find out what size the stage one jet is and ill drill your stock one out for you. I drill my own. If stage 1 jet size is too small then we can go up to a stage 2 size. Free is a lot better than the kit. For my 4cyl it was gonna be like $150 so i just ordered the bits and drilled mine myself. The difference in size between a manufactured jet and a dilled one is so small it really doesnt matter whether you drill one of buy one.