[3] The GC21 featured the distinctive air intake of a F3 car, but was fitted with a 2-litre, turbocharged Toyota 3S-GTE straight-four engine,[4] in place of the naturally-aspirated units used in F3.
Jerome Dalla Lana, driving for Inging, became the first driver to win in the car, with all five entries finishing the twelve lap event.
[5] By the final race of the season, held in November, the grid had expanded to eight cars, with Ronnie Quintarelli, also driving for Inging, winning the event.
Shinsuke Yamazaki, driving for Aim Sports, won the first event, held in March, with six cars being entered.
[10] For 2004, the closure of Fuji Speedway as part of a Hermann Tilke redesign of the circuit forced the series to move.
[21] However, the Aim Sports car, driven by Shinsuke Yamazaki, Yuuji Asou and Masaru Tomizawa, took the LMP2 class win, and finished second overall.
[26] Three GC21s were entered in the Motegi 1000 km; the regular Aim Sports car was complemented by an entry from Forward Racing, who had Takuya Shirasaka and Takeshi Itou driving for them, as well as an entry from Rs Serizawa, who ran Hiroshi Koizumi, Tsubasa Kurosawa and Hiroaki Ishiura in their GC21.