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My recent research into exhaust system supports for my M-10 yielded the following. My thanks to several members on this list for their comments. What we are talking about here applies to exhaust systems with two separate stacks. The key element is to let the stacks move with the engine (no "hard" supports to anything else). Many people have had success (and it was Alon's and Mooney's conclusion) that a loose attachment to the engine mount helped stabilize the system, limit dimensional excursions (and looked a little more logical than just letting the darn things dangle there). So, on each stack, a small flexible, reinforced rubber, "strap" about an eighth of an inch thick, 7/8 inch by about 2 inches is fastened between two clamps, attached to the engine mount and stack at a point about eight inches from the exit end. You can buy the strap if you want to -- re Mike at Univair: Alon P/N 4040089 "Alon/M-10 STRAP" for about $7 each. We made them from some hose material. The original Mooney part (P/N 600275-089) is no longer available from anyone to my knowledge.
