OE Number: 17228-RYE-A00. Please make sure your car model and OE number before placing an order. Fitment: for Acura MDX 2007 2008 2009 Size: 21x10.8cm/ 8.27''x4.25''(L*D); Inner Diameter 1: 9.1cm/ 3.58''; Inner Diameter 1: 7.3cm/ 2.87'' Function: The air intake hose is mounted between your vehicle's air intake box and throttle body. When the air intake hose, which is the tube piece that connects the air filter box and the intake manifold, becomes old or possibly even cracks, it will not function appropriately. Easy Installation: The hose matches your car. It's a good choice for you to replace the old or broken one directly.