The Eibach PRO-KIT 2092.140 is a set of four coil springs for the BMW 335i that lowers the car while keeping it livable for daily driving. Eibach describes the PRO-KIT line as performance springs that lower ride height, improve handling, and stay drivable every day. Owners on user forums describe it as a progressive-rate spring, and they generally consider it slightly more comfortable than H&R springs. That ride comfort is the main reason to choose it over a budget drop kit. A lower center of gravity also reduces body roll in corners.
Owners on user forums report that these springs apply to 335i E90 sedans and E92 coupes, but published model-year ranges differ, so confirm your exact year with the manufacturer before ordering. Installation is a realistic driveway job for a home mechanic with jack stands and a spring compressor. One forum owner described the work as nothing overly technical, however you need some special equipment, a bit of know how. Search terms enthusiasts use include E92 335i coupe lowering springs, E90 335i sedan Eibach Pro-Kit install, 335i progressive rate springs, and 335i lowering springs alignment. Because lowered cars often need a wheel alignment check, plan on one, though owner experiences vary.
Owners on user forums have run these springs with factory dampers, and others have paired them with upgraded dampers. One owner installed them after moving from stock, softer OEM suspension to BMW performance dampers. Confirm damper compatibility with the manufacturer before purchase.
Owners on user forums say a spring compressor is needed to install these springs. One owner used one for the front springs.
Owner experiences differ. One owner skipped the alignment after lowering an E92 and did not notice a difference in handling. The manufacturer's installation guidance should be checked before deciding whether to skip the alignment.
Plan on a moderate driveway job with jack stands, a second jack to support the lower control arm, and a spring compressor. Owners on user forums advise removing the inboard control arm bolt rather than the outboard one, because the outboard bolt was hard to reinstall. Reinstalling the inboard bolt can be tricky, and one owner needed to raise the lower arm under the shock mount as well as at the bolt. Owners also note that the rear bump stops should be trimmed if the instructions call for it, since untrimmed stops can cause harsher hits over bumps.
