The rear diffuser on your BMW M2 is for more than just sleek looks. It's designed to increase downforce, giving your competition coupe a better grip on the road and reducing drag, better known as air resistance. In short, factory rear diffusers improve aerodynamics overall, resulting in a more enjoyable drive. How do rear diffusers work? The one original to your BMW M2 has three parts: vertical fins, an expansion chamber, and a smooth underbody. As you drive, high-speed, low-pressure air passes underneath your car. As it heads to the rear, it enters the expansion chamber. The resulting air expansion reduces airspeed and increases air pressure. A vacuum effect occurs; air gets sucked out from under the car. With high-pressure air above the car and low-pressure air below, downforce increases, drag decreases, and your BMW M2 handles better, with minimal resistance. If you're looking to upgrade your rear diffuser, don't go aftermarket. They're rarely functional. In fact, theyre almost always for aesthetics only. To get the best results, buy a genuine BMW M2 rear diffuser. Not only are they guaranteed compatible with your sports car right off the shelf. They'll deliver the results you're looking for on the road. Order yours online from our auto parts department today!