I actually have a buddy (Used to be on FL drift before they failed and then refailed) who did the hockey pucks on a ka in an s13. The ka was stock,but the car had coils+some kind of a 2 way diff. I drove the car and it felt good,he had them on for a while and had no probs. He even drop kicked his motor to show me how stiff they were,sure as hell was stiff. So far no probs reported but I havent talked to him in a while. Not condoning this method just posting experience.

I personally would prolly never do it, I have JTO super solids, and Kazama solids, and oems in my cars. If I were going to do somthing like this I would do the oem mount w/poly or the window stuff around it to stiffen things up.