8 x 4 Oval, 18" Length, 1.5" Bore, Offset to Twin 101544

8 x 4 Oval, 18" Length, 1.5" Bore, Offset to Twin. A offset to twin configuration refers to a muffler that has an off-centre exit on one end and two off-centre exits on the other end so the exhaust gases go through a Y Piece before reaching the outlet. This configuration allows you to merge the gases from two seperate tube routes into a single outlet, or expand a single tube route into a dual section. We are often able to make the outlet diameter different to the inlet diameter; please select this as a product option when ordering.