Another point we need to discuss is how spring rates differ using Rebel or Elephant poly-bronze bushing versus rubber bushings. My car has rebel bushings with 31mm T-bars in the rear and a similar car (both of us have 3.6l) here at the local track has 28mm rear T-bars with rubber bushings. My rear compresses more than his (that sounds weird
). Point is, it would be nice if there were some real numbers with regards to effective spring rate using different bushings.