RPT Mufflers for Softail - BlackIf you're looking to get the most sound out of your new Softail, these are for you.. Mufflers make use of all of the high tech features of Cobra's regular three inch slip on mufflers, including two inch constant velocity cores for exceptional sound and performance, as well as the bonded e glass and stainless steel mesh. The constant velocity cores are designed specifically for the Milwaukee Eight engine platform, to provide the best sound and