aFe Takeda Exhaust Axle-Back 06-11 Honda Civic Si L4 2.0L 2.5in 304 Stainless SteelIntroducing 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