The Eibach Pro-Kit 4031.140 is a set of four progressive-rate lowering springs for 2006-2011 Honda Civic 4-cylinder models. The manufacturer lists the kit against the 2006-2011 Civic and excludes the hybrid and the 2.0L Si, so buyers with a Civic Hybrid should confirm fitment with Eibach before ordering. Progressive springs are designed to feel softer at rest and firm up under load, which lets you lower the stance and sharpen handling without giving up everyday ride quality. Eibach's own feature list calls out a lower center of gravity, quicker stopping, and tighter cornering.
Compared with stock springs, the Pro-Kit gives a street-driven Civic a more planted, aggressive stance that stays usable on daily commutes and occasional track days. The kit is tested with factory dampers, so you can lower the car without replacing shocks or struts at the same time, which keeps the cost down. Eibach lists a five-year warranty on this kit. Owners on user forums point out that worn factory shocks can leave the rear sitting higher than expected, so fresh dampers are worth considering if the rear looks off after installation. Search terms this kit matches include Eibach Pro-Kit 4031.140, 2006-2007 Civic lowering springs, progressive rate lowering springs, and Civic coil spring drop kit.
The manufacturer's application listing excludes hybrid models, even though the product name references the hybrid. Confirm fitment directly with Eibach before purchasing if you own a Civic Hybrid.
The manufacturer states the kit was tested with factory dampers. Owners on user forums report that worn stock shocks can change how much the rear sits lowered, so inspect them during installation.
Owners on user forums report the box contains four springs, stickers, and warranty paperwork, with no printed instructions. The manufacturer publishes an install instruction sheet (D2472) that can be downloaded from Eibach's product page.
Plan on a moderate DIY job and a realignment afterward. Owners on user forums describe the front as the more involved side, requiring a spring compressor and removal of the axle nut, with the axle pushed inward on the hub so it cannot pop out during the job. Take care not to cut the axle boots. For the rear, forum users advise supporting the lower control arm on a jack and lowering it slowly, since the spring is under tension. Forum advice also recommends against cutting the bump stops to gain extra drop, because extra compression can shorten shock life. Follow the manufacturer's D2472 instruction sheet for the correct order of steps and crush sleeve use, and get a wheel alignment once the car is settled.
