If your looking for one for a 156 DOO tunnel, then I think all that we would do is stretch the 151 tunnel design out 2.5", so really easy to do. As far as predrilled, again, if your running stock locations, if not we can make you one exactly how you want it. And the nice thing is the rear can be setup to have a built in drop which is a nice benefit on the revs for handling. I will discuss price with josh, but We will try to get a number up pretty soon for tunnels. Just hard to gauge time as each one is somewhat custom... length, suspension setup.. BUT, working on getting some numbers laid down for those interested.