The H&R 29764 is a progressive-rate sport spring set for the 1996–2003 BMW 540i E39 sedan, designed for the M62 4.4L V8 car. It is made in Germany from shot-peened 54SiCr6 spring steel and is listed as TÜV and ISO 9001 certified. Front ride height drops about 1.3 inches and the rear about 0.75 inch, which closes up the fender gap and lowers the center of gravity. Owners on user forums describe the ride as firmer than stock but workable for daily driving. Against a cheap generic coil, the steel grade, certification, and tuned rate are the main reasons to pay for this set. Long-tail search terms this part matches: E39 540i sport springs, M62 4.4L lowering springs, H&R 29764 sedan, 540i non-touring lowering kit.
Check fitment before ordering. This set is intended for sedans without the factory sport suspension and excludes Touring wagons, and lowering height can vary on cars with other sport suspension packages. Owners on user forums pair these springs with sport-type struts such as Bilstein Sport or Koni Sport, noting that original shocks were not designed for lowered springs and can wear early. The swap is a strut-out job: you remove the three upper strut-tower nuts, the lower strut bolt, and the sway bar link, then compress the spring to release it. One E39 owner called the job straightforward, while another called it a real job best left to a shop, so budget for a spring compressor and proper tools.
Owners on user forums consistently recommend replacing the original shocks when lowering an E39, because factory dampers are not designed to work with lowered springs and may wear prematurely. Sport-tuned units such as Bilstein Sport or Koni Sport are the most commonly discussed choices.
User forums discuss this, but owners note that the front springs are barrel-shaped and tapered at both ends, so trimming one means reforming the cut end to fit the spring perch. Rear springs are straight-wound and are less complicated to trim. Trimming changes the spring's behavior and is not a manufacturer-recommended modification, so confirm with the manufacturer before cutting.
Difficulty is moderate and best suited to someone comfortable working on suspension components. Plan on a spring compressor, a socket set, and penetrating oil for seized fasteners. Access is through the top of the strut tower after removing the upper nuts, then disconnecting the lower strut bolt and the sway bar link so the strut assembly can come out. Owners on user forums recommend replacing the spring perch rubbers and, while the struts are apart, the shock mounts and bearings, since the parts are already exposed. Keep the front springs intact, because trimming them is not straightforward.
