I am looking at Avon Tech M550s and they dont carry a 255/45 like I have on the rears now (with 245/40s on front). What size (besides stock) do people who get these tires run? Will 245/45 in back and 245/40s in front work? I think it gives about an inch in diameter to the rear but a slightly narrower tread width. I wouldnt mind a little oversteer for a change. Reccomendations?