Radical SR3 chassis number 938 was the first RSX built for the US Market. The car was originally delivered to Spring Mountain Racing with a 1500 Short Stroke engine but was upgraded with a 1500cc (SN 1500-195) Long Stroke engine. It has the optional Intrax triple adjustable dampers and brake and suspension logging. When delivered the car was white with red and black graphics. The pictures of the car with number 550 were taken at Spring Mountain in October 2015 and the pictures with number 333 were taken in May 2019. The pictures with the orange graphics were taken in late 2020. In January 2021 the car was located at Radical Texas / Esses Racing in Austin Texas.