The Eibach Pro-Kit for the Infiniti G37 Coupe is a four-spring progressive-rate lowering set for the RWD coupe. The manufacturer describes the Pro-Kit line as a lowering system that lowers the center of gravity, which reduces squat under acceleration, body roll in corners, and nose-dive under braking. Owners on user forums report a drop of about 1.2 inches in front and 0.8 inches in the rear, which closes the fender gap left by the factory ride height. Because the rate increases through the travel, the ride stays composed over broken pavement, so it suits a street car that also sees occasional track days. Cheaper drop springs often trade ride quality for looks, so this kit is worth the premium if you want a usable daily driver with better turn-in.
Verify the part number before ordering. The coupe kit is 6388.140, and user forums describe a 2008 coupe that was fitted with a sedan spring by mistake, so confirm the kit against your body style and model year. The manufacturer offers a PRO-ALIGNMENT camber arm kit for G37 coupes and presents it as the way to realign the suspension after installing a lowering kit. Search terms this kit matches include 2008 G37 coupe lowering springs, G37 RWD progressive springs, and Eibach 6388.140 fender gap.
The part number is listed for the G37 coupe RWD. Owners on user forums report that a different Eibach kit, 6390.140, is a 2009 sedan spring, so match the part number to your body style and year before installing.
The manufacturer markets its PRO-ALIGNMENT camber arm kit for G37 coupes as the solution for realigning the suspension after a lowering kit is installed, so plan for an alignment after the springs go in.
Owners on user forums cite roughly 1.2 inches in front and 0.8 inches in the rear. Actual results depend on the vehicle's weight and options, so confirm the drop with the manufacturer.
Replacing the coil springs is a suspension job that requires lifting the car safely and supporting it on stands. Follow the manufacturer's install instructions for the springs, and confirm you have the coupe spring set before you start. Once the springs are in, get a full four-wheel alignment. The manufacturer's PRO-ALIGNMENT camber arm kit is available if you need more camber adjustment to correct the new geometry.
