Did you have a chance to test this setup out yet? Been thinking about doing this to my pro 155 for a while now.So I had the chance to throw the khaos rails onto a stock Pro RMK using all the stock Pro RMK suspension components.
Attached is a picture showing the difference on the front rail tip up. Not a huge change but it does effectively change the limiter strap length on the stock Pro RMK (by having the tip raised, it raises the lower limiter strap cross shaft height in relation to the upper Front torque arm).
As far as the difference between the length of the Front Torque Arm, I measure both the Khaos and the RMK and they measured center to center the same, approximately 17 3/16". The front track shock length on a Khaos is 12" ctc and the RMK is 11 3/4". I forgot to measure the limiter strap length on each though... We will see if just changing the rail will make any difference on the regular Pro RMK in the playfulness or not.