Eibach's Pro-Kit is a four-spring set for the S197 Ford Mustang, the 2005 to 2010 generation. The manufacturer's listing covers 2005-2010 Ford Mustang coupe and convertible models with the 4.6L V8, so this is a bolt-in spring swap rather than a full coilover conversion. Owners who want a lower stance and sharper turn-in while keeping their factory dampers often weigh it against stiffer aftermarket setups. Because the kit changes spring height and rate, not damping, it suits a street-driven S197 that still needs to handle everyday roads.
Owners on user forums report mixed ride results depending on what else is installed. One owner ran the Pro-Kit for years alongside fresh strut mounts and an adjustable panhard bar and described it as riding well. Another paired the springs with Eibach's own shocks and struts and found the ride too firm for daily use. Searching for long-tail terms like S197 Pro-Kit lowering springs with factory dampers, 2005-2010 Mustang V8 convertible lowering springs, or S197 handling upgrade without coilovers will surface the setups owners have actually tested.
The manufacturer's product listing I reviewed names the 4.6L V8 coupe and convertible for 2005-2010, and I could not confirm 6-cylinder 2010 convertible fitment on the manufacturer's own page. Check the manufacturer's fitment guidance before ordering for a V6 car.
Per user forums, owners remove and discard the original front dust boot and metal cup, then snap on the Eibach-supplied boot over the factory bump stop. The kit's boots are meant to be used this way.
Per user forums, an alignment is recommended after installation. Many owners also upgrade the strut mounts and strut bolts to fine-pitch hardware, which makes it easier to dial in camber.
Owners on user forums describe the rear as the quicker job, about ten minutes per side once the lower shock bolts are released and the rear end is supported. The front takes more work: the brake caliper is hung out of the way, the strut is removed, and the spring is compressed with quality spring compressors, so don't skimp on those tools. One owner who finished in about three hours in a home garage recommended assembling new struts and mounts before removing the old ones. Replace the one-time-use factory strut hardware, orient the rear coil correctly because uneven rear ride height has been traced to coil position, and schedule an alignment afterward.
