V1 in my Z06 and Uniden R7 in my M3. Like others have said though, its probably best used as more of another tool in the tool box rather than just trusting it completely. I have Waze up for when I'm going to be out on the highways as well and try to limit my spirited driving to areas I know are wide and flat and I can see for a ways off and in areas that aren't as heavily patrolled. Ironically the last speeding ticket I got was in my daily driver Acura TL, oh well
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