Any room to cut a notch (a round one of course) in the side skirt just ahead of the rear wheel? Then you would have all the room you need. Otherwise, the main concern of a rectangular tip, as I'm sure you already know, is to make sure that you make it at least as large in area as the pipe going into it, or even larger. Backpressure is your enemy here. In a turbocharged Diesel you want NONE of it.
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