10 x 4 Oval, 12" Length, 1.75" Bore, Parallel Offset 100465

10 x 4 Oval, 12" Length, 1.75" Bore, Parallel Offset. A parallel offset configuration refers to a muffler that essentially runs in a straight line from the far edges of a muffler so the inlet will be to the far left of one end and the far right of the other. This configuration is primarily used to "tuck" the majority of the muffler into an existing space on the configuration, which can be particularly useful for builds with a very small amount of workable space.