Throttle body is a part of the air intake system that responsible for the amount of air getting into the engine. Since the best ratio for oxygen and gasoline is 14.7: 1 and that is the ideal condition for engine to run the car. In this way, throttle body letting either more or less air get into is not a good thing. There is a cover on the throttle body named gasket, and it is designed to seal the air in the throttle body. Of course, the throttle body gasket will get tear and wear one day owing to long time usage and heating. It is common for gasket to leak. In this way, the air goes through the throttle body and into the engine will not precise, leading to a poor engine performance. We understand you cherish your BMW car, and we understand you don't want to waste your time, energy and hard-earned money, and that is why we strongly suggest you shop here. We provide all BMW genuine throttle body gaskets with a surprising cheap price.