Introducing the Takeda axle - back exhaust system for the 2006 - 2011 Honda Civic Si with the L4 - 2.0L engine. In testing, this system produced a max gain of 6 horsepower and 5 lbs. x ft. of torque. This exhaust is constructed from 2.5 brushed finish, mandrel bent, 304 stainless steel and is TIG - welded. The system uses a high - flow, polished 304 stainless steel muffler which improves performance across the power band while maintaining a great tone. To finish off this exhaust is a massive 4 double wall, slash - cut, 304 stainless steel Takeda laser - etched tip. This exhaust uses all factory hanger locations for a hassle - free installation. No modifications necessary.