Dynojet offers a wide range of kits to fit any application. Several types(stages) of kits are available to fit your specific needs. Stage 1 Motocross kits intended for motorcycles with a stock engine using the stock airbox, air filter and stock pipe. Stage 1 kits are fully adjustable to allow the use of a well designed aftermarket pipes and stock replacementair filters like K&N. Stage 1 kits are designed to improve throttle response and driveability and in most cases power increases of approximately 5% throughout the entire power range can be achieved.