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      07-17-2008, 06:30 PM   #13
TwinTurboXI
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Drives: 2011 135i
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I would guess they used a tuned version of the tt v8. The M5/M6 v10 would probably be too low on torque to move that fat a$$.Rumors are going around about a ttv8 in the next m5, so it would seem a logical choice in the x6.
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