These kits are designed to fit dual-quad applications with either standard flange or 4500 series carbs. The nitrous plates may be mounted in a front-to-back or side-to-side configuration with 350-70092, or side-to-side only with 350-70090. Each kit comes complete with everything you need including a 10-pound nitrous bottle (shipped empty) and four stages of jetting ranging from 100 hp to 250 hp.