I felt a little left out because I had the only M4 performance edition in the field and, although the conventional belief is that it's the same as the regular M4, I found it to be stiffer. Like everyone in the test pointed out, it's fast when it's on line but not so fast off line. So, as far as changes, this is what I did in the new app (I'll post the tune later today). - Inverse rake - I had found that the cars would rotate more under braking with regular rake, because the rear would lose grip and rotate, but it was just too uncontrollable. Inverse rake also provides better acceleration and top speed. Why? I think it has something to do with grip transferred to the rear. - Positive front toe - When the weight transfers on the front, the outside tire really makes the nose dive for the apex. I had negative toe in there still as a remnant from early versions of the calculation and it dawned on me that I had completely neglected to review that. With the new tune, I posted a best time (so far) of 2:07:030. I'm anxious to see what the others can do.