This unique dual transverse exhaust system is constructed form mandrel bent stainless steel and is TIG welded. This system was designed and engineered by tuning the perfect tube lengths; ultimately maximizing performance across the power band while maintaining a great tone. aFe carefully engineered this system to maintain distinct exhaust tones. All exhaust syst ems are engineered and manufactured in our Corona California manufacturing facility. All systems use factory mounting locations providing stability and hassle free installation. High quality band clamps are used for a complete 360 degree sealing surface. Dual free flowing transverse mufflers are used to absorb high pitch tones producing a powerful sound and unleashing all available horsepower and torqye. Takeda 2-1/2 IN 409 Stainless Steel Cat-Back Exhaust System Honda Civic Si 12-15 L4-2.4L Honda Civic Si 12-15 L4-2.4L