We have a variety of mufflers available in sizes ranging from 3" to 5" in diameter and in standard to ultra quiet configurations. Dimensions below Standard (Stainless steel) 3": 3" Inlet, 14" Body Length, 5" Body Diameter, 19" Overall 4" (20" Overall) : 4" Inlet, 14" Body Length, 7" Body Diameter, 20" Overall 5" (20" Overall) : 5" Inlet, 14" Body Length, 8" Body Diameter, 20" Overall 4" (30" Overall) : 4" Inlet, 24" Body Length, 7" Body Diameter, 30" Overall 5" (30" Overall) : 5" Inlet, 24" Body Length, 7" Body Diameter, 30" Overall Ultra Quiet (Aluminized) 4": 4" Inlet, 44.5" Body Length, 9" Body Diameter, 51" Overall 5": 5" Inlet, 44.5" Body Length, 10" Body Diameter, 51" Overall The sizes of the inlet and outlet refer to the inner diameter of the pipe
