Designed for ATVs using the stock airbox, air filter, or the stock or aftermarket pipe. These kits are also fully adjustable to allow the use of well-designed aftermarket pipes and K&N stock replacement air filters. DynoJet kits are designed to improve throttle response and drivability – in most cases; power increases of approximately 5% throughout the entire power range can be achieved. Jet Kits include jets, needle, springs, shim and installation instructions