Not sure which 2004 Ford Mustang Suspension Systems are right for you? We have over 2412 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Jaclyn L from Burbank, IL said, "I bought the Pro-Kit for my 2004 Mach 1. I was a little concerned that it wouldn't be a noticable drop, but I think it is perfect. I compared my Mach to my friends Mach that has the stock springs and you can totally tell mine does sit lower. I haven't scraped the bottom at all, so I think it is a perfect height. The install was easy...well my friends did it for me...and the ride has improved a little bit also. So overall I am very happy with these springs!I was also very pleased with the service from Autoanything. They shipped right away and this is were I found them the cheapest! Cannot beat that deal!"