Just like the MK2 sport pro kit, this kit offers the same tried and true performance, with the additional benefit of being liquid cooled. 12mm piston/pin. This setup makes 14-17hp, when a typical athena sport is around 8-9. There is a reason we can barely keep the mk2 kits on the shelf. Pair this with a c16 yasuni pipe, carb and crank.... your set.