My Dart has a 904 in it now. The front half of the 42rh should be the same as the 904, correct? So the tunnel mods are from the crossmember back? No enlarging in front of the crossmember?
Now that I don't know. I would have to read through posts to find out. I think od's are the way to go. As close to "best of both worlds" as you can get if mileage is on your list of things to conquer.