Well it was time to replace the MT Street R Drag Radials, 6k miles on them & they had become egg shaped, I guess I should have been lifting the rear when parked in the garage, especially after a long drive in the summer when they get VERY hot, I went with the same 325-50-15 but in the Hoosier brand DR, they seem VERY soft to the fingernail, so now waiting on a cool weather Track rental day, it is still pretty warm [HOT] here in Southeast Texas, so the next time out will be testing the new 4.10 gears,, it had 3.54 & the new Hoosier's.