I have done 6 tunnel swaps, for the amount of time you are looking at all I would do with that sled is a tunnel extension and put the 151 on it. It won't quite work as well as the drop and roll but for what you are going to use it for work just fine. Save the cash and spend it on your sled. If you can handle changing the tunnel in the first place you will not gain a whole lot in the fact that you are working on two different sleds. All tunnel swap work takes is time and patience. Just don't think the extra dollars are worth it. However if you are dead set on doing a tunnel the one from mountain perfromance makes the works even easier. All alignment holes and bolts holes are predrilled and line up well.
