Electrical tape helps, and works better than allowing metal to metal contact. This is what I did to rather than reinstalling the top isolators for the rear springs (all other iso's were retained). I tried removing all of the iso's on my GT, and ride quality went down.
^^That last pic makes that silver 2v look like a toy, lol. Basically, if you get the Steeda's, the only way to make it look good is to run no iso's. I know people on here are so against cutting springs, but hell, get 'er done.