RoadsterSport Street Single MX5 Miata Muffler Fits 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 and 2014 Mazda Miata MX5 Proudly made in the USA, all Stainless Steel has lifetime warranty. This MX5 Miata Muffler was designed for both RACING...and STREET. dual exhausts on a straight four cylinder Miata is a ridiculous waste of weight for the serious sports car enthusiast (Mazda talks about gram strategy in the development of this MX5 but they wasted a lot of weight on duals that provide no performance benefit over singles YET lots of extra weight). Just 12 pounds means this MX5 miata muffler is 15 pounds less than the stock MX5 miata muffler!