These sleds are out of the box. According to Black Magic they noteiced the f sleds gained a tremedous amount of speed after 100 miles which they have not seen on previous sleds. After my first 100 miles I could for sure feel the diferece my self. It would be interesting to see the results of the shootout with the f7 fully broken in. The Rev seems to be quick out of the hole but it dies like a sick pig shortly after a quarter mile. I had no problem spanking one today. I also pulled 109 mph on GPS.