Sean Kelii was the overall winner of the 2006 Ducati Monster Challenge with his track-prepped 1999 Monster 900. His bike started out as a Cromo, but after a bad crash he focused his rebuild on creating the ultimate "track-day dominator." To reduce weight, the Sacramento, California, resident installed numerous carbon-fiber bits such as BST wheels, fuel tank, headlight buckets, handlebars and many more. By the time he was finished, he had reduced the bike's wet weight to just 355 pounds. Further improving handling is an Ohlins shock and a Showa fork from a Ducati 998 with Ohlins internals held by a beefy six-bolt lower triple-clamp. Braking is handled by a Brembo GP radial master cylinder actuating billet two-piece calipers that act on full-floating rotors. Engine upgrades include a 944cc kit and Keihin flat-slide carburetors that together help generate over 100 rear-wheel horsepower. Kelii has invested more than $40,000 in his award-winning machine, which sounds like a lot until you consider he took home a $9995 Ducati Monster S2R 1000 for winning.