These killer shorty pipes by Add On Inc. fit 2004 - 2013 Harley Sportsters. They feature nice smooth curves and are 1.75” diameter. The pipes include a mounting bracket but will require use of your stock exhaust mounting hardware and flanges. These pipes are fit with the O2 sensors used on 2007 and up Sportsters. If running them on a 2004-2006 Sportster than you will need to install plugs in the 02 sensor bungs.