Thread: Test drove the N20 2012 X3...
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      02-13-2012, 11:33 PM   #7
Robocheme
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Drives: 2013 X3 28i, 2014 X1 sDrive
Join Date: Nov 2011
Location: Northern California

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I'm not a car guy. Why do they detune an engine? For emissions? mileage? something else?
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