This cat-back exhaust system is constructed of 3 IN - 2-1/2 IN mandrel-bent brushed finished 304 stainless steel tubing for maximum strength and durability. Finishing off this exhaust system are dual 4-1/2 IN diameter blue flame 304 stainless steel clamp-on exhaust tips. The tips features a laser etched Takeda logo for a unique style. This system produces a deep sound unleashing all available horsepower and torque. Utilizing a factory style flange and hangers this system is a direct bolt-on system, which requires no cutting or modifications for a hassle-free installation. State-of-the-art computer-aided design technology is utilized for precise vehicle fitment. 100% TIG welded by certified craftsmen for race proven strength and durability. TIG welding provides the strongest welds reducing stress cracks. Takeda 2-1/2 IN to 3 IN 304 Stainless Steel Cat-Back Exhaust w/ Blue Flame Tip Honda Civic Si 22-24 L4-1.5L (t) Honda Civic Si 22-24 L4-1.5L (t)