We superfinish all the bottom ends in our race bikes and its like $325-$375, depending on how much stuff. Its $350 for everything in the bottom end of a 450, minus the crank. Worth hp that's for sure. I know it's not cryo just another option, and its not some indiscriminant polishing process. Its a state of the art metal treatment. It does free up some HP and extends the life of a trans.
-Ion