We had ground control coil overs on my brother's 94 audi cabriolet and they sucked ass. When you lift the car up, the whole assembly goes down and when you put the car back down the whole thing "pops" back in place. If I was to do coil-overs I'd do a set-up that already uses threaded shocks. That's the best way to go, I don't like those short ground conrol collars you mount over your stock shocks. On the other hand, we put a nice $1000 B+G coil over set up on his A4 and that was nice. But as I was saying, I don't want to spend a grand on a real coil over set-up.