BChevrolet Cobalt Catback Exhaust System 3.5" Black Muffler Burnt Tip - L61 LAP ReviewbP PP Chevrolet Cobalt Catback Exhaust System 3.5" Black Muffler Burnt Tip - L61 LAP PMade of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and DurabilityPDyno Proven to Instantly Increases 10-20 Horsepower Low End TorquePTIG Welded CNC Machine Flange for Resistance against Pressure and CorrosionPAggressive Deep Sound while Ensures Smooth Exhaust Gas Flow; Increase Engine Output and EfficiencyP3.5"(OD) Muffler Exhaust Tip; Inlet: 2.25"; Main Piping Diameter: 2.