TWO VINTAGE OUTBOARD MOTOR RACING EXHAUST PIPES/STACKS BRITISH ANZANI/HARRISON?

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TWO VINTAGE OUTBOARD MOTOR RACING EXHAUST PIPES/STACKS BRITISH ANZANI/HARRISON?:
$200.00

These are (I think) a matching pair of early outboard motor racing exhaust pipes/stacks. They were found with some other freshwater parts here in Michigan. They are about 16\" long and the hole exit diameter is about 2 7/8\" OD. The square mounting flange is 3\" x 3\" with holes 2 1/4\" OC. The flange hole is 1 1/4\". I am not sure of the motor application at this time but will do some research and add it to this description if found. They are made of heavy cast aluminum. Your thoughts are welcome. They are in good used condition with no flaws that I can see. Two are included in this sale but I have two more I will be selling in a month or so...or will offer to sell to the buyer of these.