Air kits are designed to give peak performance with a great custom appearance. Several styles allow you to give your bike a personal touch. Thunder has teamed up with the best in the industry (K&N and Dyno Jet) to give you the best performance and quality. All kits include the proper K&N filter for optimum air flow. The kit also includes the adapter for your specific bike. Please choose your bike type above before ordering. NOTE: Jetting is required with the air kit if engine is carbureted. For FI use power commander or lighting FI.