I believe Daryl Greenameyer holds the world's speed record for piston aircraft. He did it in a highly modified F8F back in the 70s. It was previously set in 1939 by another highly modified aircraft, the Me109. This was a prototype of Willy Meshershmidt's, not a production Bf109.
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Kick the tires, light the fire, first up is Lead, breif on Guard!