Dinan High Flow Throttle Body - 2004-2005 BMW 645ci

Many 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 breathe better for more horsepower and torque, most effectively in wide-open throttle scenarios.

Not compatible with the X5 4.4i (E53) from 2000-2003, Stage 3 Engine Software recommended for optimum performance and drivability

• More Power (E60 545i & E63 E64 645Ci): + 5 HP @ 6500 RPM, + 4 LB-FT @ 5500 RPM (coupled w/ engine software)
• More Power (E65 E66 745i): + 8 HP @ 6500 RPM, + 8 LB-FT @ 5500 RPM (coupled w/ engine software)
• More Power (2004-06 E53 X5 4.4i): + 8 HP @ 6500 RPM, + 8 LB-FT @ 5500 RPM (coupled w/ engine software)
• More Power (E53 X5 4.8is): + 8 HP @ 6500 RPM, + 8 LB-FT @ 5500 RPM (coupled w/ engine software)
• Improved throttle response
• Bored 3mm larger for a 8% increase in air flow area