You can hit the two-century mark, but it will cost $25 per mph.

BY GREGORY ANDERSON

“Watch this for me, would you please?” asks Didier Theys, the Belgian endurance driver, indicating the digital speedometer in the 806-hp Koenigsegg CCX supercar. As I nod, Theys floors the throttle and we’re off, rounding the entrance to the lone, long runway of the Dade-Collier Training and Transition Airport in the heart of the Florida Everglades.

Life in the public fast lane is for chumps. Serious speeders will want to test their mettle on the Xtreme Challenge, an event hosted by a team of Belgian instructors from World Class Driving (www.worldclass­driving.com). The company has built its reputation on traveling tours, in which participants sample a handful of sports cars for a day on open roads for $1695. The Xtreme program runs $4995, presumably due to the cost of renting an entire airfield for the day and expensive insurance.

Before the fun begins, participants must first sign away their lives. Item No. 8 on the liability waiver begins with this line:“Entrant hereby acknowledges that the activities of the event(s) are very dangerous and involve the risk of serious injury and/or death and/or property damage.”

Despite the risks, entrants are not guaranteed to break the double-century speed barrier on their own because success is not only a matter of courage. The Dade-Collier runway is nearly two miles long, but that isn’t enough to reach 200 mph before the all-important braking zone without first slingshotting oneself—practically sideways—through a big, double-apex right-hand turn that precedes the runway. Come in too slow, and the car will fail to build enough momentum. It is a perfect demonstration of slow in/fast out cornering—and the reward for smooth driving is official membership in the 200 MPH Club (which includes a certificate, a T-shirt, a baseball cap, and a crystal trophy keepsake).