I'm sure this question has been posted a million times because I've read a ton over the past couple of weeks since I purchased my 2011 Ultra Ltd. 103, and the more I've read the more I'm unsure as to what I should do. The bike is 100% stock right now and I want to get better sound and more pep, so the options are to replace the breather/headers/exhaust with: 'Cat-less' header, and new exhaust, or A complete 'true dual' system, or A complete 2-1 system I like the sound of duals, but I've read I will lose low end torgue. I like the torgue of 2-1 (like fat cats) but I've read you lose the 'harley rumble'. So, how much low end torque do you lose going with duals vs. 2-1, is it like a couple of lbs, or is it more like 10 lbs? Is there only a difference on paper, but not really on a 'seat of your pants' dyno? If there really isn't much of a difference between the two then I'd probably go duals. But then, what is the diff between a good free flowing header and slip-ons, vs duals? I understand I'll have better torque with free flowing 2-1-1 headers and slip-ons that duals? Is that true? And then another thing to add into the mix is that eventually I may want to upgrade the cams in a year or two and I don't want to have to redo the whole system and spend a bunch more $$ to do so. I ride 2 up a lot, and do a lot of longer trips, but I also use my ride as a daily commute so it's a real all around ride. Any recommendations on what would be a good approach would be appreciated. Oh ya, obviously I'll need to add a tuner and I'll probably go with a MasterTune TTS so if I upgrade cams later I don't have to pay for more dyno work. Thanks!