Long thread but I'll add more. My race tune was too conservative on the up shifts for what I wanted. They revised it w in a couple days tops. It does clunk on the 2-1 downshift especially if u stop quicker than normal when it's going into 1st. It's not bad enough to worry about and if u slow down slow it won't do it but it does grab hard no matter what from 2nd to 1st. I will probably get another revision at some point bc I don't want it breaking traction in the winter if there is snow on the ground on the down shift. There is some major torque release going on there. U can feel it release/buck forward when it engages. U just have to know how to make it not bang hard. It runs and drives great though!