I went with the Arnott “ultimate ride” system. Air compressor mounts in the existing airbox, manifold mounts under the seat and behind the gas tank. They have a switch that has a built-in pressure gauge now, that wasn’t around when I bought my system. I’ve gotten used to just eyeballing the shock height that is needed for a good ride depending on if I’m running solo or 2 up, road conditions, etc. but a gauge would be SO nice. It takes a little time to decide how to route the wires and air lines, if you care about how the final appearance turns out. I went with the chrome shocks ( Fox pieces) that have functioned flawlessly, but the chrome is flaking off and is the worst looking part of the bike at this point. At the lowest setting I love the way it looks but it’ll drag on the lowest speed bump and possibly herniate a disk, at the highest setting it’s as ugly as a man’s ass but would probably clear a crosstie. It is really nice to have the ability to drop it when cruising round town for looks and raise it up for the ride home. Cost bout $1700. Limited lifetime warranty. I don’t regret it.