SR3 chassis number 117 was re-bodied to RSX specification, with a 1340cc engine, for the 2018 25 hours of Thunder Hill race. The car came in first place in class and second overall, driven by Dave House, Paul LaHaye, Ethan Stone, and Mike Miller. The car also won the 2021 25 hours of Thunder hill driven by Jeff Shafer, Tony Bullock, Jordan Missig, and Josh Sarchet.
