Tech tip, on the XTX if you look at the cut outs towards the back of the tunnel. You'll see where the re-enforcing plate under the boards, covers the inner part of the cut-out.
I used a die grinder with an aluminum cutter, to open up the plate to match the cut-outs. Not as effective as better boards. But it did make a noticeable difference when stomping snow through the cut-outs, to clear the boards of snow.