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      09-28-2012, 02:35 PM   #3
MDORPHN
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Drives: AW 1M
Join Date: Oct 2010
Location: Wash, DC

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As I understand it, having the M button on closes the wastegates, thereby decreasing spool time and speeding the transition from partial to full throttle.

When the M button is off, the wastegates are open which reduces backpressure/pumping losses and increases efficiency/fuel mileage.

Neil
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