Good for you! I suspect you will lose some top end (MPH) by lifting. Probably not much, but this is one of a few reasons why the newer sleds aren't as fast as they could be... in conjunction with their tall track lug profiles. Also, you are changing the geometry of the sled so it may not handle quite as well. Just like with most everything... if you change one thing you may end up changing other settings. You might try experimenting with your ski spring settings (three hole locations) for more/less ski pressure on the snow. Love to see some pics! Good luck!