Bassani Down Under Header Pipes For Harley Touring A True Dual exhaust system has easily become a popular system to run on your bike especially for touring models. Nothing beats the nostalgic look, sound, and feel of the system that has many riders coming back to what they know and love. Features: 1 3/4 tubing Pipes have both 18mm and 12mm O2 sensor ports and plugs included Design keeps heat from your legs and attractive true-dual design dives under the bike for a traditional look Available in Black or Chrome Heat shields included Made in the USA