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How about a turnbuckle to stop the motor from pulling. Leave plenty of slack so normal driving does not effect the turnbuckle. Headers, and side pipes have no give, so the weakest link will go.
Insert some pics, and maybe I can give you some advice on mounts? I have done exhaust for 30 years, and worked on everything from Rolls to beat up Chevys. In SF Ca. you never knew what would drive in the door.
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20mph is not fast, unless you are doing it in a 3/2, 1000sq. ft. house on 10 ft. waves! 
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