Stainless Steel Collectors Without Catalyst For Original Or Arrow Silencers Headers material stainless steel Junction (outlet) diameter (mm) 54.00 Oxygen sensor plug NO CO sensor plug SI Db Killer NO Not all exhaust pipes are made equal, the Arrow Exhaust Header bears all of Arrow’s experience accumulated from world class racing. That experience has lead Arrow’s 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.  Features: Combine with an Arrow Slip-On Exhaust and Arrow Mid-Pipe Kawasaki ZX6R / ZX636 2019-2020 to create a full system (each sold separately)  TIG welding throughout Significant weight savings over stock exhaust system