Unleash performance gains of up to 10 HP and 11 lbs. x ft. torque with aFe's Takeda 3 - 2 mandrel bent, 304 stainless steel cat - back exhaust system for your Honda Civic Si Sedan with I4 - 1.5L (t) engine. This exhaust system is 100 hand TIG - welded by certified craftsmen for race proven strength and durability and designed with dual, free - flowing 304 stainless steel muffler s to improve performance across the power band while maintaining an aggressive tone and long lasting, good looks. Finished with dual 4 - 34 X 4 - 14 oval polished stainless steel tips and etched with Takeda brand logos gives the Civic Si a stylish, custom appearance.