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I just did a 32 coupe in what you are describing. He used a muffler similiar to a magnaflow. It roared with the cutout, and had a mellow tone with the muffler. The muffler was straight through on one side, and had an S bend on the other. If the name of the muffler comes to me I will pm you.
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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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