I put the SRT suspension on my R/T 2 months ago. Found a kit with only 1000 miles on it for dirt cheap.
Boy did it handle soo good!!
It did shake me and rattle me quite a bit also.
I had a problem with a weird clunk coming from the front that no one could figure out that made me take it off in the end.
Plus, I think the SRT suspension was expecting a much heavier engine also so the front was not near as low as a true SRT.
It made the R/T a little flat looking, almost sagging in the rear.
(See picture)
Today I put the R/T kit back on and I must say I really did miss the smoother ride. It just feels more like the new car I bought in the first place again!!

Morale of the Story, Don't put SRT suspension on an R/T.......8)
Plus, I don't think White cars look that good low to the ground like other colors.

I will probably later on put the SRT Springs only on the front to add a bit more of a slope to the look of the car, but never the shocks again.

Hope this helps someone else thinking of doing the same.