Cycle Shack Slip-Fit replacement Mufflers. MHD-139-SD. New. Sold. Cycle Shack Slip-Fit replacement Mufflers. New! $75. Sold. New, never installed. MHD-139-SD. 19" long with 1-3/4" inlet diameter. Slash down outlets. Officially, these mufflers fit: FLSTN/I Softail Deluxe (2005-Later). Re...