Both pipes are handmade with unique welds that are distinctive to any other set made handcrafted from the 2”. below: Segmented Welds : A more raw look known as "pie cuts" on piping. It is multiple weld fragments along the pipe. O2 Bungs : If you have a 2007-2020, you will NEED O2 bungs. Details: Stainless Steel. • •O2 Sensor bungs added for fuel injected •Works with forward controls. •These are made-to-order, turn around time is 2 weeks For purchasing you may make note of which color you would like to order and size of o2 bung sensor 18mm or 12mm. Worldwide shipping available.