The Eibach PRO-KIT (part 4088.140) is a lowering spring set from the brand's performance line, sized for the 2012–2013 Honda Civic Si coupe and sedan and the 2013–2015 Acura ILX with the 2.4L four-cylinder. It replaces the factory springs to lower ride height, which reduces the fender gap and gives the car a more planted, sportier stance.
Buyers who want a lower center of gravity without a harsh ride will find this kit makes more sense than stock springs. The manufacturer rates PRO-KIT as sporty yet comfortable, with a moderate performance gain aimed at daily driving and mild track use. It lowers the car by 1.0 to 1.5 inches. A lower center of gravity cuts squat under acceleration, body lean in corners, and nose-dive under hard braking. Track-focused drivers wanting firmer damping-style feel should compare the SPORTLINE, which lowers 1.4 to 2.0 inches and is firmer and more aggressive.
Search terms enthusiasts commonly use for this setup include Civic Si lowering springs 2.4L, ILX 2.4 lowering springs, and Eibach 4088.140 fitment. Published model-year ranges vary, so confirm your exact year and trim with the manufacturer before ordering. Because lowering springs change ride height without changing damping, inspect the factory shocks and struts before fitting new springs, since worn dampers will not match the new spring rates.
The manufacturer lists the PRO-KIT line at 1.0 to 1.5 inches of lowering. The exact drop for your specific model and year was not confirmed in the manufacturer material reviewed, so confirm the model-specific figure with the manufacturer before ordering.
According to the manufacturer, PRO-KIT is the comfort-oriented choice, with a moderate performance improvement suited to daily driving and mild track use. SPORTLINE lowers more (1.4 to 2.0 inches), is firmer, and delivers a significant performance improvement for performance driving and track use.
