Super 50 Stainless Steel - 2.25 Dual In / 3.00 Center Out - Mild Sound; The Super 50 series muffler is a larger version of Flowmaster s 50 series Delta Flow muffler. Originally designed for trucks and SUV s it is also well suited to muscle car and high performance applications. In addition the larger case size significantly reduces interior resonance and provides a deep rich tone along with mileage and power gains. Constructed of 16 gauge 409S stainless steel and fully MIG welded for maximum durability.;