10 x 5 Oval, 18" Length, 3" Bore, Twin Special 102821

10 x 5 Oval, 18" Length, 3" Bore, Twin Special. A twin special consists of a muffler with a single centre to offset inlet and two centre to offset outlets on opposite sides- one on the same side as the inlet and one on the opposite side. The gases also pass through a chamber. This muffler is highly customisable and we can advise on the degree of volume achievable by customising the size of the chamber, perf size etc.