Headers/Downpipe KTM 390 DUKE models 2021-2022 KTM RC 390 2021-2022 - Downpipe replaces the original pipework. - TIG welding by hand ensures a smooth internal surface for decreased internal turbulence and increased potential. - Compatible with the OEM silencer/muffler and any other that fit the original pipes. - Downpipe Material: 304 Grade Stainless Steel. - Increased potential with enhanced sound. - No modifications required. (Re-mapping, Power commander). Lambda sensor (O2 sensor) is located on the original front pipe which is retained and used with this upgrade. - Kit includes downpipe and instructions. - Two year Black Widow warranty.