VIBRANT PERFORMANCE STREETPOWER Oval Muffler 2.5in inlet outlet 1126 Mufflers & Resonators Vibrant StreetPower Oval Muff 5in x 9in x 15in long body 2.75in in I.D. x 2.75in out Center Center Vibrant Universal Streetpower 2.25in Stainless Steel Dual In Out Oval Vibrant Performance 1104 Vibrant Performance StreetPower Performance. 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.