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I would imagine there is a flexible section of exhaust somewhere that isolates the exhaust from the engine to the exhaust piping. This is how most big diesels are done, they very rarely put isolators on the mufflers. Only other thing I would note is that eventually rubber fails and maybe they did not want the muffler dragging on the ground when the rubber fails, just something to think about, you may make yourself a safety strap to catch the muffler in the event the rubber ever fails. Definitely will not hurt to have the muffler isolated from the frame.