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Flowmaster - 50 Delta Flow® - 2.25 Offset In / 2.25 Offset Out - Moderate Sound 000 in Tapered - AluminumThe 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 aluminized steel and fully MIG welded for maximum durability.