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Not sure why someone has not mentioned that Hudson offered a "splitter" that attached to the exhaust manifold and then ran the pipes under the car and connected it to a single muffler. And, out of the muffler they had two exhaust pipes that went under the car to the back exiting below the bumper with two pipes next to each other pointing down. For my car, I determined the exhaust pressure that I had and the resistance I wanted and then increased the size of my pipe to balance the exhaust. I added a flowmaster and had a single 2 3/4 inch pipe exit by the tail pipe. When my car raced at Irwindale, California one of the owners had Ike Smith weld a cutout at the first turn below the firewall as a dump tube. I extended that tube to the passenger side of my car and capped it. When I want to be obnoxious I uncap the dump tube.