Floyd Mayweather
Mayweather is one of the most successful boxers of all time. His net worth is more than Mike Tyson and many other famous boxers before him. Mayweather is not shy about flaunting his wealth around either (via Art of Gears).
His car collection is also reflective of that fact, as Mayweather has more than a few expensive cars to choose from. His Koenigsegg CCXR Trevita is one of the fastest cars in the world. The hand-built design is unrivaled, and the engine is tuned to perfection.