Don't waste the $100 mate, they work well on stock rides. Had a set on my Fat bob and do work well but as soon as I went to stage 1 it had to be tuned. It will run as lean as all hell with a set of these and stage 1 gear and the extra heat won't do it any good with summer coming

I run x14ieds on my Iron, but I have stock air cleaner with V&H shortshots (quiet baffles). I've only had them on a couple of weeks (thanks 666!) but the difference is very noticable - pulls like a train. But I believe if you are changing ac, you'll need a fuelpack.