I just mounted 4 of the same tires on the car. (Actually i am on my 5th to 8th RE-11) The new mould release is completely overrated. It doesn't take much to get rid of it. The new tires he has are very grippy, but they do tend to track left and right. If he doesn't have tires in the front to match it, of course the car is going to drift all over the place. Also if you have any screwed up alignment setting, everything is going to be magnify now as your tires have way more grip. Lastly, make sure they mounted the tires correctly with the right side out and at the right pressure.
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