The Eibach Pro-Kit set is a progressive-rate lowering spring kit for the S197 Ford Shelby GT500, replacing the factory front and rear coil springs to lower the stance. Owners on user forums describe the springs as progressive-rate units, which means the coil rate firms up as the spring compresses. That design aims to control body roll and nose-dive under braking while keeping the ride tolerable on the street. Compared with a heavier aftermarket option, one user forum thread notes that the Ford Racing springs and struts weigh roughly 25 pounds more than this Eibach kit, a practical advantage for owners who want to keep unsprung and suspension mass down. Lowering the center of gravity also helps the car feel more planted in corners, which is the core reason to choose this kit over stock hardware.
Fitment is the first thing to check. The 2007-2010 GT500 coupe and convertible are the most consistently referenced applications, and owners on user forums have reported roughly a 1.6-inch drop at the rear on an '08 GT500. Fitment on 2011-2014 cars is reported inconsistently, and the drop on those years is generally quoted as smaller, around 1 inch front and 1.2 inch rear. Confirm your model year and body style with the manufacturer before ordering. Long-tail searches such as GT500 progressive lowering springs, S197 Shelby lowering springs 35115.140, and 2008 GT500 coupe convertible lowering kit match this product's intended use.
Owners on user forums report that the drop is noticeably smaller on Track Package cars, with one owner estimating about half an inch. Results vary by car, so confirm fitment and expected drop with the manufacturer before buying.
A user forum discussion notes that Ford Racing L springs carry the same spring rate but sit at a lower ride height, which suits owners who want to keep the factory ride. Owners on user forums describe the Eibach kit as the option for a more noticeable drop.
