I have eibach sportlines. Bought them used from a guy here on stangnet. They're ok. Honestly didn't drop it enough for me. But I guess they're supposed to be even lower than the H&R SS's (dont flame... just my understanding). I had a ford probe before that had oem replacement struts, and intrax springs, and front and rear strut tower bars. It handled AMAZING. It would own my mustang hands down in handling. I know the mustang isn't meant to handle that well though. or atleast it doesn't seem like it. When you guys say the springs sag... what do you mean? Does the car lower more or something? It seems when i go over a bump at decent speed the back end of my car jumps into the air. I think im gonna go with some mach 1 struts/shocks one of these days.