Just installed a Thundermax with Fullsac head pipe and Jackpot Dyno Tuned Mufflers on my 2010 FLHTK. WOW! My baby is running better than ever! Can't wait to get the Doherty Power PACC air cleaner on her and really let her breath! Everything went on perfectly (after having to load USB driver manually). Had one decel pop on the way to test run breakfast, and tried to make it pop on the way back. Couldn't do it. Runs WAY cooler already! WAHOO!!