Vibrant STREETPOWER Oval Muffler (Polished 304SS, 2.5 In 2.25 Out) Vibrant StreetPower Oval Muff 5inx9in x 15in long Muff body 2.5in in I Vibrant Performance 1145 STREETPOWER Flat Black Oval Muffler Walmart.com Vibrant STREETPOWER Muffler, 3 side inlet x dual 2.5 outlets iRace. Vibrant Performance has one of the most complete offerings of mufflers & resonators for all segments of the industry. Our "true straight through" internals feature a stainless steel perforated tube that is wrapped in our premium quality, multi layer sound suppression materials that will produce a low, deep tone while allowing for unrestricted flow and maximum horsepower. Vibrant Performance mufflers & resonators are the perfect fit and suitable for all naturally aspirated and forced induction applications.