I was reading up today on Energy Suspension Poly bushings for the front and rear control arms of our Challengers. The price really is not that bad. Has anyone here used these and if so what was your impression. How long do they take to install as well. I plan on lowering my Challenger in the next few months with the Eibach Sportline kit (struts and springs) and was wondering if installing these bushings would be best to do it then or can it be done at another time but be a huge pain in the butt.