I just posted this same issue on my 370Z
I guess this post is very common, I had the same thing I just replaced by rear tires (I had to replace one so I replaced both) I feel the same thing you do as soon as I pass 80mph it is crazy twitchy and wanting to go side to side.
I posted this about 3 days ago I took it to Nissan for alignment and back to the tire shop for further inspection, they replaced one tire for being out of round but that did not fix the issue.
Everyone here is letting me know to go ahead and use the car for about 200 miles. I will be doing that and see how it feels, I do not need my front tires yet still at about 85% but if this does not go away I will have to stop being cheap and buy the two front ones.
I am using Toyo Proxes4 stock size 245/45zr/18/100w Rear and stock Yokohomas in the front.
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