Those are from a company called Thunder Mustang.
They're powered by Falconer V-12 engines.
They are fast, approaching 400 MPH in racing trim, and they are very sexy as well.
Race 75 was destroyed in an accident at Reno in 2010. He lost the engine on the last lap, tried to make a 180 to land, but the winds that day were in the 30-40 knot range, and the aircraft bounced, floated, and cartwheeled. George Giboney, who owned and flew it, walked away with just minor bruises and scrapes.
Here's a story with some great pics of the crash, but the facts are completely wrong. This was no takeoff accident.