The Super 40 features Flowmaster's Delta Flow technology. It's larger case profile provides the best of both worlds of performance and sound. The Super 40 has that deep powerful sound of the Original 40 series but with all the benefits of performance and low interior resonance from the Delta Flow technology. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.Features: Durable Fully Welded 16 Gauge Aluminized Steel 3 Year Limited Warranty Deep Aggressive to Moderate Exhaust Note Moderate Interior Resonance Excellent Performance On High Horsepower Vehicles Race Proven Patented Delta Flow® Technology No Internal Packing To BlowoutProduct Description: Super 40 Series Muffler, 2.50" IN (D) / OUT (D): ea, 16 Gauge Aluminized SteelPit Stop USA offers Flowmaster Super 40 Delta Flow Muffler - 2.5" Dual Inlet / Outlet 9525454 at low everyday prices. Be sure to check out all our products from Flowmaster including Flowmaster 40 Series Delta Flow Mufflers.