i installed my own, biggest pain in the ass i have had to deal with. simple, and straight forward to install, and nothin to em, but their still a *****. You have to install a steering extension, gas line extension, and remove your drivers seat and carpet to pull the shift linkage through, as was said above. For my personal experience, i snapped the two rear body mount bolts when removing them, and im lucky it was only two. i had to cut out two squares in my floor and weld in new plates with existing nuts on them - not fun at all.
-in terms of drive quality, they say nothing changes and remains factory quality, but thats bs, like everyone mentioned you get a "top heavy" feel. Not bad imo, but noticeable. keep in mind i only installed a 2" not a 3"
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edit: also they have yet to make brackets for the rear bumper so you get an ugly gap, but i modified mine to move the rear bumper up and get rid of the gap.
this is the only pic of the rear bumper i could find but it gives you the idea-