aFe 49-36621-B Takeda 3 IN to 2-1/2 IN 304 Stainless Steel Cat-Back Exhaust SystemaFe 49 36621 B Takeda 3 IN to 2 1 2 IN 304 Stainless Steel Cat Back Exhaust System Performance Gains: In testing, the cat back exhaust system resulted in gains up to +10 horsepower and +11 lbs. x ft. of torque, as measured on aFe Powers in house dyno. Aggressive Sound: Dual, free flowing, 304 stainless steel mufflers are used to absorb high pitch tones producing a powerful sound and unleashing more horsepower and torque potential. Dual 4 3 4" x 4 1 2"