(en) 2000 Toyota Ultimate Celica Concept | Toyota. Supercars.net (23 april 2016). Geraadpleegd op 28 december 2021. "To reach the 500 horsepower goal, TRD immediately began work on tuning a four-cylinder production powerplant previously used in Toyota’s championship-winning IMSA GTP race cars of the early ’90s, and Rod Millen’s record-setting Pikes Peak Hill Climb runners."