| I recently ordered the Energy Suspension master kit from the internet and was looking on SPL and saw the solid subframe bushings. Are these what is included in the ES kit and just solid instead of a rubber base or is it something that can be used in addition? What are bushing collars for? Can those be used in addition with the ES kit to give the car a stiffer connection with the subframe? Is anyone here using the solid bushings from SPL or any other company? What are your thoughts on the poly kits vs solid?
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