STAGE 1 PERFORMANCE UPGRADE TO SUIT BMW X SERIES X5 N63B44 TWIN TURBO 4.4L V8 TILL 09/2013This Mace ETC and K&N's air filter have been put together to meet the performance upgrade requirements of BMW X5 S63B44 and N63B44 V8 engines. Mace ETC eliminates the delay that exists between the throttle pedal and the butterfly in the throttle body, re establishing throttle response and bottom end acceleration while improving low torque. There are different performance modes in this ETC that helps you to increase throttle response and improve
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STAGE 1 PERFORMANCE UPGRADE TO SUIT BMW X SERIES X5 N63B44 TWIN TURBO 4.4L V8 TILL 09/2013