Hey, jellyroll: In addition to the FRRP lower'g sprgs what else did you (have to) add? I'm told that an adjustable panhard bar (I bot the BMR adj bar) is pretty much required. I also have the jounce (anti-bump) set. Will I have a problem with camber, alighment, rougher ride, etc? I have all the parts--sprgs, bar, jounces--but havent installed anything yet. Thanks for ur imput. BTW, didnt ur 2011 GTCS already come with the tower brace? Mine did.