Mine did not have the lower isolators either - neither on the limited not the SRT6. I do not believe either had ever been taken apart, so as to remove them. The car sits about 3/4" too high, IMO. I do know the supercharged engine and supporting equipment will be heavier than the NA setup, but I have not found out how much of a difference it is. I out a 100# weight on the front of the car, and it pulled it down a bit, but still not enough. I have a very large round of changes coming for under the hood. It will be a bit heavier at the nose (I am predicting about 100-125# heavier). I will likely cut part of the bottom coil of each front spring to get ride height where I want it. 1/2 coil off should shorten it, with the associated increase in spring rate. I'll do the math on it, once I get to a final configuration.