NASCAR organized the NASCAR Thunder 100 , a pair of exhibition 100-lap races on the East Circuit , a 1.4 miles ( 2.3 km ) layout which utilizes the pit straight and esses , before rejoining the main circuit near the Casio Triangle .
The 1.4 miles ( 2.3 km ) layout which using the pit straight and S-corners , before rejoining the main circuit near the Casio Triangle .