We installed a set of the KW Variant 3's on our Project
TriloG Camaro for compatibility testing purposes and can't say enough good about them. The quality and fit was great, definitely no complaints there. As for installation ease, it really doesn't matter whose coil-overs you go with, the installation will be basically the same. The KW's can also be installed in the driveway using simple hand tools. The only specialty part you will need is an outside spring compressor like what is shown
here. You can usually pick one of these up at your local auto parts stores for around $30 or even rent them for less.
In the rear, you simply remove 4 upper bolts and one lower and the whole assembly comes out of the car. Compress the springs, remove the center nut, then remove the upper mount. The KW coil-over hand assembles without any specialty tools and the kit comes with a spanner wrench for adjusting the spring collar.
In the front, you simply remove the top nut on the strut retainer, remove two bolts on the spindle, pop the upper strut mount out of the strut tower and that whole assembly comes out too. Compress the springs, remove the center bolt, then take off the upper mount. The KW coil-over hand assembles like the rear.
Nothing too complicated, basically a good weekend job then off to the alignment shop!