These fit 2000 and newer twin cam dressers. These are E-Series Elliptical Disk System. Thats what nPorker calls them,I call them Ovals, very nice made in the USA. Came off a 03 Road Glide and have about 1500 to 2000 miles on them. Will work on Carb. or EFI systems. These are especiall nice on injected bikes with performance in mind. Fully adjustable by adding or subtracting disk for back pressure, sound level and power. Awesome with a power comander of some kind. The right muffler has yellowed up a little, the left muffler has small rock ding on lower side of muffler out of sight. I'm now on a stock carbed Standard so there for sale Great X Mas gift. Paid around 465.00 will ship to your door UPS 200.00 includes insurance. I have pictures if I can figure out how to send them. Randy E Mail rlkmlk@fmtc.com