Eventually, Foyt hired another teammate, fearing he would be beaten by Muther. Muther's best Indy car finishes were in 5th position in 1968 at Riverside and in 1972 at Milwaukee. He was considered a very capable racing driver and was respected by his peers even though he was not a front-runner.
Foyt hired another driver to challenge Muther, who was recognized as a skilled racer despite not consistently leading the pack. Muther's notable achievements included finishing in 5th place at both Riverside and Milwaukee.