The GC coilover threads are not on the actual strut/shock like most coilover setups. They actually use a threaded collar that goes over the strut/shock that the adjustable ring goes on. Problem #1 the collar on the back has space between the shock, therefore making tht clunking noise that all GC owners complain about, even after sealing it up, you get noise still on the big bumps. Problem #2 since it is a collar, it is shorter and so is the spring. The rear spring is about half the size of a regular spring, therefore causing crazy bottoming, you have to raise it up to almost stock to not bottom on that shit. Needles to say, The AGX's are amazing on handling, so I am going with regular springs, and using the GC's for shows only. And thru all my searching, Tein is in the top 2 so far. But Eibach doesn't go low enough. So Tein it is!!!