Honestly, I dont know, because the bike they are on has never been ridden since I built it, but considring people with 2 piston calipers stop fine, I just cant see its going to make the big difference, the pistons seem smaller than on the 4 pot one, I cant see its going to be a huge improvement. But, Ive never ridden it! As said, it does look mean and to be honest it was bought as a bit of bling when speccing my ultimate build.