VIR was best known to be “America’s Nurburgring” where Car and Driver’s held its annual “Lightning Lap” shootout, beginning right when Kenny and Toby began participating in track days.
http://www.caranddriver.com/features/lightning-lap-2006
The 4.1-mile “Grand West” configuration combined the “Full Course” typically used for auto races and the infield “Patriot Course” through a tight U-turn in the middle of the back straight (T13). The configuration was not frequently used for track day purpose, due to the time challenge of a long warm up and cool down laps. (And since it was not a public road like Nurburgring, there was no way of paying toll to just drive a lap.)

Mazdadrivers was one of the few clubs that organized track days on “Grand West” and Kenny and Toby jumped on the opportunity to drive the Lightning Lap in 2006 and 2007.
Their Boxster was well suited to the course. Just powerful enough for the Climbing Esses and the big front straight, with mid-engine nimbleness for the tight twisty infield section. The length of the track (which translates to few laps per session) and 30+ corners made it a steep learning curve.
Car and Driver’s lightning lap times were also a good yardstick to measure how their driving skill progressed. For example, Dirty Molly’s best lap in 2007 was 3:20 with suspension modification and sticky RA-1 tires, while comparable cars (e.g. S2000, RX-8) in pro drivers’ hands (or good amateurs’) were 5-10 seconds quicker on street tires and without modification.
It meant Toby and Kenny “needed” even more track time!