I have Bill's Alterk-tion and the Air Bar from him. All with coil-overs. I haven't goten it on the road yet but I am back from playing war and I should have plenty of time. Now it is just a money issue! LOL.
I really liked the ease of instalation of both kits.
I wish I would have thought about what size tire I was going to do before I welded the brackets to the rear end. If you move them in you can get more tire. You will have to move the mounting point for the other end of the bar too but it is a small task. I have to redo that part and then I am mini-tubbing.
I just heard Bill came out with a new version of Alter-k-tion with a torsion bar set up! wish I would have waited. The Alter-k-tion has been on my car for almost three years and I haven't driven it once.