The Sprint Filter KD2 series is an air intake with both dynamic and static features. When used with the flexible conduit that brings air in from outside the car to the kit, it expands and compresses the air flow thanks to the Venturi effect to supercharge the engine. When it is instead used statically with a velocity stack, it provides the engine with a more fascinating sound for those who love it.Sprint Filter KD2 is quite small, so it can be very easily fitted inside any engine compartment and because of its multitude of diameters, it can be used on both small and large displacement engines. longlife air filter