SCR Forklift Parts - Whittier, CA. Aftermarket muffler (17510-U1100-71) designed for Toyota forklift models 6FGCU20, 6FGCU25, 42-FGCU20, and 6FGU15. It has a body diameter of 6.14", a smallest tube diameter of 1.46", and a largest tube diameter of 1.65".