Arrow 71713MI Racing Collectors for Kawasaki ZX-6R 636 19-20Arrow Exhaust Headers Kawasaki ZX6R ZX636 Not all exhaust pipes are made equal, the Arrow Exhaust Header bears all of Arrows experience accumulated from world class racing. That experience has lead Arrows to fine tune each part of their design and manufacturing processes. Everything from pipes diameters, sections bends, components, welding and layout are carefully tested to produce a product with high performance, reliability and last but not least,