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      01-06-2011, 10:22 PM   #2
MysticBlue
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Drives: '09 M3 DCT Coupe, ---'15 x50i
Join Date: Apr 2008
Location: Eastern Oregon... They call 'em rigs here

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It has variably controlled compressor and in effect is "disengaged" when needed, so no need to turn it off. The compressor only operates when needed. Mine is always on, even on the track.