Part #: 38148.140, set of 4 springs, for the 2011-2015 Cadillac CTS V Coupe. Eibach's PRO-KIT is designed to deliver higher-performance handling and a sharper look without giving up ride quality. The kit uses a progressive-rate spring, so the stance drops while the car stays livable on the street. It is a direct replacement for the factory front and rear coil springs, and the Pro-Kit is the Eibach kit most buyers use as a first step before a full suspension build. Searches for a 2011 CTS-V coupe progressive lowering spring with factory magnetic ride compatibility are where this kit fits best.
Versus stock springs, the main gain is a lower center of gravity, which helps improve handling during acceleration, cornering, and braking. The kit is tested with factory dampers, including magnetic ride, so you can lower the car without buying new shocks. That matters on a car where a coilover conversion is a large jump in cost. Owners on user forums describe the spring as soft at light throttle and firmer when body roll, dive, and squat build under hard driving, which is the progressive behavior Eibach advertises. Cheaper generic lowering springs rarely document damper compatibility, so this kit is the safer choice for a V-Series owner who wants a documented fit.
Fitment is limited to the coupe, so confirm your body style before you order. Owners on user forums describe removing the 18 mm upper control arm nut, popping the upper mount free, and sliding the shock and spring assembly out. The two 13 mm bolts at the bottom of the shock hold the assembly in place. Pay attention to the beveled black washer on the shock shaft, which should sit snugly in the white nylon sleeve. A floor jack under the lower control arm helps, since the arm seats over a bushing bracket. Install times and compressor needs vary by source, so check the manufacturer's install guidance before you start.
The manufacturer states the kit was tested with factory dampers, including magnetic ride, so the springs are designed to work with the stock shocks.
Details vary. The manufacturer's product page lists a five-year warranty, while other listings describe a million-mile warranty. Confirm current warranty terms with the manufacturer before purchase.
The manufacturer's page lists this part number for the 2011-2015 CTS-V Coupe. Confirm fitment for other body styles with the manufacturer before ordering.
This is a driveway-level job for a mechanic with a basic socket set, a jack, and jack stands, though it takes longer than a bolt-on part. Owners on user forums report that the front and rear springs can be swapped by removing the upper mount and sliding out the shock-and-spring assembly, with a small floor jack used to support the lower control arm. The most common gotcha is reseating the beveled washer and nylon sleeve correctly on reassembly. Install time and whether a spring compressor is needed vary between sources, so verify the procedure with the manufacturer.
