Gibson Performance Exhaust 55131S Stainless Steel Superflow Universal Muffler 4 x 9 x 13 in Oval Body; 2.25. in. Offset Inlet; 2.25 in. Offset Outlet. Deep Powerful Sound Chambered and Louvered Design, No packing, No Baffles or Weak Deflectors Minimal Interior Drone, Reversible Limited Lifetime Warranty