aFe Takeda 2.5in SS MACHForce XP Cat-Back Exhaust | Honda Civic Si (12-14) (49-46602)Introducing the new Takeda exhaust system for the 12 14 Honda Civic Si Coupe FG4. In recent testing this system produced 9 horsepower and 9 lbs. x ft. of torque. This exhaust system is constructed from 2. 50 mandrel bent stainless steel and is MIG welded. The system uses a high flow muffler with 2. 50 tubing which improves performance across the power band while maintaining a great tone. To finish off this exhaust is a dual double wall angle cut 304