• K&N 57-Series Generation 2 Fuel Injection Performance Kits and 63-Series Aircharger Performance Kits are two identical products, and share the same components between the two systems. Fuel Injection Performance Kits (FIPK’s) have been declared exempt by the California Air Resources Board, and carry a current and valid executive order (E.O.) number certifying them as legal for highway use in California, and states which recognize California emissions laws, for the vehicle applications each system is listed for. Aircharger Performance Kits are the same as Fuel Injection Performance Kits which have not yet been declared exempt by CARB. 57-Series and 63-Series intake systems utilize a black plastic molded intake tube, which is formed and contoured to optimize the air flow path from the filter to the engine. FIPK’s and Airchargers also include an oversized K&N clamp-on filter and heat shield, designed to protect the filter from heat radiated by the engine.