Arrow 71639MI Stainless Steel Racing Collectors for Yamaha YZF R3 19-24/MT-03 16-19Arrow Exhaust Headers Yamaha R3 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, good looks.