The K&N Generation 2 induction kits offer guaranteed horsepower, aerodynamically engineered non-metallic rotationally moulded tube for low air intake temperature and less intake sound. Each kit is engineered to specific vehicle design. Installation usually takes less than 30 minutes and the kit will last up to 100, 000 miles between services.
The K&N 57i generation 2 kits replace the factory air box, some applications come with a heat shield to help prevent heat soak around the filter. The nylon structure dissipates heat more efficiently and lowers the intake temperature to the engine. The air intake noise will increase, not quite as loud as the original 57i kits, although under hard acceleration the car will definitely sound more aggressive.