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.