I had a friend introduce me to a mechanic at the ford dealership. They said it would cost $450 if they did it during hours but since this guy does stuff after hours and just uses the shop at the dealership I got a much better deal. He was going to install them for $150 but after he dropped a wrench on my right front fender he said there was no charge. I ended up giving him $50 that he regretably accepted. The things is barely noticable. I would advise finding someone privately intalling them or doing it yourself if you can. You can look at my page. I also have the ford racing C springs on my 2003 GT mustang.
http://www.cardomain.com/ride/1354351