The Eibach Pro-Kit (part 35125.140) is a four-spring lowering set for the S197 Ford Mustang coupe from 2011 through 2014, covering the 3.7L V6 and the 5.0L V8 GT. Replacing the factory coils lowers the car's center of gravity, which reduces squat under hard acceleration, body roll in fast corners, and nose-dive under braking. Owners on user forums commonly report that the V6 coupe drops about 0.8 inch in front and 1.2 inches in back, while the GT drops about 1.0 inch front and 1.5 inches rear. This makes it a strong choice for buyers searching for a 2011 Mustang V6 lowering spring kit or a 2011-2014 S197 Eibach drop spring set.
Compared with a cheap generic spring, the Pro-Kit is built to work with the car's factory dampers, and owners on user forums often keep their stock shocks and report that ride quality stays close to stock. That makes it a practical upgrade for a street-driven coupe that also sees occasional track days or autocross, without the cost of a full coilover conversion. Stock wheel and tire fitment is a common concern, so it is worth verifying clearance if you run larger aftermarket wheels.
Yes. The manufacturer's install guide covers the 2011 Mustang with the 3.7L V6 and the 5.0L V8. Owners on user forums report using them on 2011–2014 coupes, and they note that V6 cars drop less than GT cars.
Yes. The manufacturer says to check and adjust camber, caster, and toe after installation. Owners on user forums report that alignments done shortly after installation can be off, so many suggest letting the springs settle for a couple of weeks before having the alignment checked.
The manufacturer does not require one. Owners on user forums disagree: some report that a lowered rear axle shifts sideways and recommend an adjustable panhard bar to recenter it, while others report no problems without one.
This is a practical job for an experienced home mechanic with a hoist or sturdy jack stands, a spring compressor, and a torque wrench. The manufacturer's install guide recommends a hoist, lists about four hours of labor, and advises that only qualified mechanics experienced with suspension work should perform the installation. Keep the stock spring isolators, dampers, and tubing, mark the upper strut perch orientation before disassembly, and install each spring with the Eibach logo facing up. The front springs are marked for position, with the front marked .001 and the rear marked .002. Owners on user forums say the rear springs are the easiest part of the job, and that the front struts require care when compressing the springs.
