I too suggest keeping the TCS on, seeing as when its raining and i take it off, the car gets sideways any time i try to turn, and bringing back a 3000+ pound car from a full out drift isnt the easist thing to do :D
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I would be scared as hell....to drift a $40,000 vehicle...specially in the rain. I have tooken Traction Control off a few times and pushing it to the limits but all I got was some wheel spin and the back of my car getting a little sideways. Even do it seems very fun...but scared to mess up the car....Also one of my tires had gone flat...I went to the dealership they said it would cost $200 for 1 new tire...and went to some other place that had the same tire same company same size for $25!!!
I know that was way off subject....but ya I wouldnt recomend taking of Traction Control especially in the snow. Because that will cause even more wheel spin and less traction.