Dinan High Flow Throttle Body - 2002-2006 BMW 550i/650i/750iMany people seem to be under the false impression that the new Valvetronic engines don't have a throttle body. This is clearly not the case however the throttle body for these applications functions as part of the traction control system, as well as a ''safety valve'' of sorts. Regardless of the function the size of the hole still represents a restriction of intake air flow, making the larger bore of the Dinan high flow versions enable the engine to