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Want the Ultimate design in a rear shock tower mount? You've found it. These rear shock mounts are designed for use on the track and racing. This set of mounts will help your rear shocks perform the best they can in those conditions. The advantage to using a mount with spherical bearing is that it allows the shock to freely move off axis without side loading the shock shaft like rubber or polyurethane mounts do. Side loading a shock increases stiction and wear which decreases its efficiency. Because these are mounts without an isolator (rubber or polyurethane) to dampen road noise and vibrations we do not recommend them for street cars. These were designed in-house and developed for our own track and race cars.
Want a race-spec rear shock mount but with the comfort of a factory bushing? This ECS rear shock mount combines the precision and articulation of a spherical bearing with the isolation of urethane bushings. The stainless monoball bearing is lined with PTFE lubricant and suspended in 80A urethane and housed in a hard anodized 6061-T6 aluminum mount. The spherical bearing is a better design than most rear shock mounts because it allows the shock to move and tilt without side-loading the shock shaft (which leads to premature failure of the shock). Most Genuine BMW and aftermarket shock mounts are not designed for shock angles and the stress that track or performance driving will put on the shock shaft. The ECS shock mount is properly designed to handle these loads. The internal bearing is also replaceable - it will be years before you have to replace the entire mount. The ECS mount is fully encapsulated to prevent the common shock mount failure of the stock mount design.
ECS RSM features:
* - the RSM comes with the BMW standard 10mm shock shaft bushings. 12mm is used on some performance shocks and 14mm is used on some true motorsport rear shocks.
Elevate your BMW E46 or Z4's performance with the BMW E46 Z4 Ultimate Performance Rear Shock Mount Kit. Engineered for maximum durability and performance, this kit ensures precise handling and stability. Designed to withstand the rigors of aggressive driving, it offers improved suspension response and reduced noise. Upgrade your BMW E46 or Z4 with this premium rear shock mount kit.