in my case it was really the tires plus cold and salty road conditions. I was running 10psi with the NA rear differential and with those tires. 1st gear was useless, 2nd gear under WOT was pretty much not there and 3rd gear i would feel the tires almost coming loose as well. I am not going to go into details but pretty much i was in 3rd gear going on a slightly uphill and bent road and right when boost came on by tail came loose, counter steered but the pole was right there. I am not a bad driver but it was my fault for boosting knowing that the tires were shit. I never expected it to be that dramatic in 3rd gear on almost a straight road.