well i finaly broke in to the 13's and thats no joke the ls1 swap was worth it going from a 15,9 to a 13.1 at 107.34 mph is a big improvement just need a set of stickys now and ill be right in the 12's. verry impressed with what she can do. on bfg G force ta. nice tire by the way it hooked really good for a street tire.