thanks for the advice. i wouldn't get them if it weren't for you helping me out. i think im going to go with the eibach kit to be more safe and new CC plates. and i might as well get new isolators, it'll probably help out. my mustang is all stock suspension.
I've owned a few Foxes / New Edge 'Stangs ('82, '86, and '01) and have some recommendations:
1. Before you do anything
else to the car, get a good set of subframe connectors. Make sure they have the crossbar that ties in to the seat mounting bolts. Maximum Motorsports makes a great set. A muffler shop can weld them in for you for less than $100.
2. Eibach Springs and new polyurethane isolators are a very good choice. I don't recommend lowering a Fox more than 1.5" - below that you start to get some annoying bump steer and tramlining effects, and your exhaust system will take a beating from speed bumps.
3. If you go with stiffer springs, I highly recommend that you upgrade the struts/shocks.
4. CC plates are a must. All of my FoxStangs tended to chew up the inside edges of the front tires, even at stock ride height. CC plates eliminated the problem and saved me $$$ in premature tire replacement. And the MM plates I used had a spherical bearing instead of a rubber bushing, which firmed up the steering feel.
5. Consider using polyurethane steering rack bushings. They did wonders for steering feel.