I'm realizing that I can't actually find any threads or evidence of anyone else online actually installing this kit. I recently installed it as a part of my front subframe refresh I did on my 06 JCW. It was only an additional $33 so I figured a bit of extra support certainly can't hurt anything. The kit requires you to tap a M14x2.0 hole in the rear hexagonal piece of the control arm. This part is already hollow but not round. So you will need to drill out the hex bar to accept the tap. I found that it is very important that you drill and tap the hex bar all the way down to ensure that the bolt and washer included with the kit fully bottom out. If the threads are not deep enough the washer will not press against the bushing and basically accomplish nothing.

Once the hole is tapped its very simple to install, push the control arm into the bushing, add the washer, lock washer, bolt with blue threadlocker, and torque to 83 Ft lbs. I also greased the flat face of the washer where it makes contact with the LCA bushing. The washer and bolt do turn with the control arm under normal operation, so the lock washer and threadlocker are a must to ensure it doesn't start backing out.

Tough for me to say if it does anything compared to a standard poly bushing upgrade. I went right from factory bushings to this setup, but I certainly like the idea.

 

I felt a huge change when I changed all my OEM bushings (from 2002!) to the purple Powerflex kit. That probably was because there was nothing left to the original bushings!😁

 

I imagine that kit will make a difference if you are full racing spec and running some WIDE tires pulling massive corning loads. Otherwise, for a street car, I don't that kit is adding much. Also, you could probably piece it together for much less than the cost of entry for the PowerFlex "kit". Its basically just a couple bolts and washers, unless it also includes the drill and tap...

 

I did the same thing when I did my suspension refresh. I don't know how much difference it makes, but my R53 after the refresh with full PF bushings everywhere (front and rear) responds like it's hardwired to my brain.