I have the spoiler out all the time now and I hope the TC will keep it going straight. Tire people sure don't like Continental Tire for some reason. They also don't want mine in a trade even though they all said they have alot of tread, almost like new. They will take other brands but these on the Xfires are an odd size in the rear. I'll just use these for awhile longer. Especially since it's about $1,500. drive out for a new set of Michelins.