50 Delta Flow Stainless Steel - 3.00 Center In / 2.50 Dual Out - Moderate Sound; The three chamber design utilizes Flowmaster s Delta Flow technology along with an internal tuning chamber to reduce sound inside the vehicle. Provides the same performance and exterior tone characteristics as the two chamber but with less interior resonance. Constructed of 16 gauge 409S stainless steel and fully MIG welded for maximum durability.;