K&N offers three different series of intake systems which are designed to be bolt-on, application-specific products guaranteed to increase horsepower in their intended applications. There may be more than one option listed for your vehicle; in the event more than one type of intake system is listed for your application, here is a brief description of the differences between K&N's intake systems:
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.
K&N 77-Series Metal Intake Kits perform the same function as our other intake systems, but are constructed with an aluminum intake tube, rather than a molded plastic tube. 77-Series Metal Intake Kits are offered for late-model trucks and SUV's only, and include a low-maintenance polished intake tube, oversized K&N clamp-on filter and heat shield, designed to protect the filter from heat radiated by the engine. An aluminum intake tube cannot be formed or contoured the same way a plastic tube can be, so often times when both a plastic tube intake system and metal tube intake system are offered for one vehicle, greater performance will be achieved from the plastic tube system, because of the molded tube. However, the metal tube still offers a guaranteed horsepower increase over stock, and offers a visual appeal under the hood that cannot be achieved with black plastic. Most 77-Series intake systems have been declared exempt by the California Air Resources Board for the vehicle applications each system is listed for.
K&N 69-Series Typhoon Intake Kits are offered for sport compact and performance-oriented passenger cars. All Typhoon intake systems are constructed with aluminum intake tubes, and are offered in three configuration styles, depending on vehicle application. Short Ram (SR) intake systems use a one-piece intake tube and locate the oversized K&N clamp-on filter in the location of the stock air box. Cold Air (CA) intake systems use a one-piece intake tube and locate the filter outside of the engine compartment, often in the fender well or bumper area. This configuration is offered only when a greater performance increase is achieved over a short ram design. Complete Cold Air (CCA) intake systems use a two-piece intake tube, and can be converted from a cold air system to a short ram system, in the event of inclement weather, to prevent water ingestion by the engine. Most cold air and complete cold air systems include a K&N DryCharger filter wrap, which repels water from the filter element, to offer additional protection from water. Typhoon intake systems are offered in a variety of finishes, depending on application, which can include polished, blue, red, silver, wrinkle red, wrinkle black, and flat black. Not all Typhoon intake systems are offered in all color options. Most 69-Series intake systems have been declared exempt by the California Air Resources Board for the vehicle applications each system is listed for.
K&N 71-Series Blackhawk Intake Kits are a free-flowing, mandrel-bent aluminum tube air intake system that is guaranteed to gain power. It replaces your vehicle's restrictive factory air filter and air intake housing. This low restriction air intake allows your engine to inhale a larger amount of air than it would from the stock air intake. More air means more power and acceleration. This K&N Blackhawk Induction Air Intake System comes with black components including the K&N high-flow air filter and heat shield. The attractive textured black powder-coated finish tube features an engraved K&N plate welded on to which gives it a clean, high-performance look under the hood. The intake tube accommodates the factory mass air sensor and a replacement silicone crank case vent hose. The oversized cone shaped air filter is made from an oil-free synthetic filter media. This Blackhawk Induction System cannot be sold in California. It is not legal for use in California or other states adopting California emission standards.
Please visit http://www.knfilters.com to access our application search, and view all products currently offered for your vehicle. To determine if a particular intake system is CARB exempt for your vehicle, click on the part number of the intake system(s) offered for your vehicle, and then click on the "Vehicle Applications" link at the bottom of the following page.