My 94' z28 has the nasty groans. I was wondering if anyone had any of the energy suspension kits on their z28 and what they thought.

I bought my car from the original owner, and it sat for a few years, while he did maintain it and run it occasionaly, all the bushings in the suspension are toast.

 

Not on the Camaro but I used their bits on my '78 GM 4X4 along with a 6" lift kit and I'm very pleased with it.
The old body mounts were all toast and even if they were new I doubt they would not feel as solid and stable is the poly stuff from ES.