The Eibach Pro-Kit (E10-46-035-01-22) is a set of four progressive-rate lowering springs for the 2018 Kia Stinger GT 3.3L. Eibach describes it as a way to lower the center of gravity and sharpen handling without giving up daily ride quality, and the manufacturer states it was tested with factory dampers. That makes it the budget route compared with a coilover swap: you keep your existing struts and shocks and avoid the cost and labor of a full strut replacement. Owners on user forums say the ride feels firmer than stock but not harsh, with less float over bumps and less nose-dive under braking.
Confirm your drivetrain before ordering. The manufacturer's vehicle search lists this drop for the AWD GT 3.3L at 1.4 inches front and 1.2 inches rear, while its main product page shows an RWD version at 0.8 inches on both ends. Owners on user forums report that the springs fit and function on RWD cars after checking with Eibach. The front AWD install is the labor-intensive part: owners describe removing most of the spindle-side suspension and separating three compression-fit ball joints per side, so a spring compressor and ball joint separator are essential. The rear is much simpler, and a realignment afterward is recommended.
The manufacturer lists the 1.4 in front and 1.2 in rear drop for the AWD model and a separate 0.8 in front and 0.8 in rear drop for RWD. Owners on user forums report that the AWD-labeled springs fit and function on RWD cars after confirming with Eibach, so verify your drivetrain with the manufacturer before ordering.
The manufacturer states the springs were tested with factory dampers, so the kit is designed to work with your existing shocks and struts. Owners on user forums generally report the ride is firmer but not harsh after installation.
Owners on user forums recommend a wheel alignment after the new springs are in, since ride height changes affect camber and toe. Some owners with stock camber arms reported their alignment stayed within spec after installation.
Plan on a full afternoon or more, with the front AWD springs being the hardest part. You will need a quality spring compressor, a ball joint separator, a puller for stubborn joints, and a torque wrench. Owners on user forums warn that the front ball joints can be difficult to free from the aluminum spindle without the right separator, and that the rear springs come out quickly once the lower arm and shock bolts are removed. Inspect the rear bump stops while you are in there, and get an alignment as soon as the install is complete.
