Just did this last night to my 09 Ulysses XT and it made just enough of a difference to make me like the sound of the bike. I still think it's too quiet for me but this is a great temporary fix till I can afford my drummer. I do think I lost a little torque at higher speeds but then again that might be because I just got my Uly and am used to my firebolt. I definitely noticed an increase in torque at low speeds and a smoothness about it that wasn't there prior. Also it does tend to initially fire up faster. If any problems occur, I'll post em.