I ordered the Extreme low kit for my xB. The build quality is amazing, they are very good coilovers. I got custom spring rates (14k/18k) which is very stiff and they ride incredibly well considering there is almost no suspension movement. My only complaint is they do not get you on the ground like I expected. The fronts go as low as I could ever need, I'm actually hitting my sway bar in the front, but the rear not so much. I am definitely pretty low but not as low as I would like, so if you're looking to be slammed I would recommend also buying the Randode hub drop kit as well as removing the front sway bar or replacing it. All in all they're great coilovers, could go a bit lower in the rear like I said, but with the randode hub drop kit, I should be as low as I wanted.