The H&R 50435-2 is a sport spring set for the second-generation BMW X5 (E70) with self-leveling rear suspension, the air-based system fitted to many of these SUVs. The kit replaces only the two front coil springs and adds two rear links that work with the self-leveling height sensors, so the factory air system stays in place. Owners on user forums describe this as the practical way to lower the stance without deleting the rear air suspension, which is the main reason to choose it over a generic lowering set.
Ride feedback from owners on user forums varies. Some say the car rides softer than stock and handles more sharply. Others found the car bouncy, particularly on X5 M models, and several moved to adjustable dampers afterward to control body motion. If you want a firmer, more controlled feel on a daily-driven X5, budget for upgraded dampers alongside these springs. Search terms that match this kit include E70 X5 self-leveling lowering springs, 2007-2013 X5 sport springs with rear links, and H&R 50435-2 SLS kit.
Owners on user forums suggest checking the original window sticker for the self-leveling rear suspension option. This kit is only for vehicles with that system, so confirm your configuration before ordering.
Owners on user forums report that the set includes two front springs and two rear links, which covers the front and the rear self-leveling sensor linkage.
Installation is a front-spring and rear-link job, and owners on user forums describe it as manageable for an experienced home mechanic, though the front work involves strut-side disassembly. Reinstall the rear links so the self-leveling sensors read correctly, and expect to have the vehicle aligned once ride height is set. Forum members also note that the dealer cannot simply reprogram the rear height to match a lowered car, so plan the rear setup carefully before you start.
