The Invidia Gemini R400 Exhaust features a design that has minimal bends with a larger piping diameter. The muffler inside contains continuous piping design and use of Advantex material that results in an excellent free-flow exhaust with optimized back pressure, giving greater horsepower, torque gains and a rich deep sporty sound. The use of SUS304 polished stainless steel piping, Mandrel bent to shape, state of the art CNC machine made flange, Robot TIG welding and polished stainless steel or Titanium tips, provides the Invidia Gemini R400 Exhaust with outstanding durability and appearance.