I met a guy at Bonneville with a simple ram air pipe to a plenum. The plenum ha a pressure gauge hooked up. He said the pressure at 120 mph was about 3psi. It was a Harley with a single carb. He had a dial a jet enrichment he used to compensate for the airflow. Simple and it worked pretty well.
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Top speed 123.369mph. Ohio mile
Worlds fastest 250 ninja
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