Rxmotor 2.5" Short Ram Cold Air Intake Fuel Gas Saver Dual Fan Universal Fit Super Charger Twin Turbo TurboCharger (RED) This JDM intake fuel saver features "DUAL fan" system which rotates up to maximum Speed of 55,000r/min Light weight aluminum design helps cooler air flows to the engine and more dynamic control over the aftermarket intake system. Diameter: 2.5" Length x 2.5" Inlet/outlet with a Dual Fan As air travels through an intake it bounces around bends and elbows in the hose causing it to slow down pinning air can be less susceptible to these abrupt changes in direction Universal Fitment for Stock , Short Ram Intake or Cold Air Intake system