The H&R 29779 is a progressive-rate sport spring set for the 986-generation Porsche Boxster and Boxster S. The manufacturer describes its sport springs as its top-selling line, made from 54SiCr6 spring steel, shot-peened, and produced at its ISO 9001-certified plant in Germany. Compared with stock coils, the set lowers the center of gravity and firms up cornering roll while keeping daily ride quality reasonable. For buyers searching for a 986 Boxster S lowering spring that does not feel harsh on public roads, the progressive rate is the main reason to pick this set over budget springs.
Fitment is the detail to verify first. Trims, model years, and option packages affect both the lowering amount and whether the set is a match, so check your VIN with the manufacturer before ordering. Owners on user forums report roughly six hours for a full-car install, with the rear taking about twice as long as the front because the rear axle and toe control arms must come off. Plan for a four-wheel alignment afterward, and expect that some cars will need adjustable rear toe arms to reach the desired camber. Forum consensus is that lowered springs can shorten shock life, so many owners replace the struts at the same time.
Fitment depends on model year, trim, and option package, and published application lists do not fully agree. Confirm compatibility with the manufacturer using your VIN and option codes before ordering.
Owners on user forums report running these springs with the original struts, but some note that the stock struts do not perform as well with lowered springs. Many owners pair the springs with a stiffer damper and replace the struts together with the springs.
Yes. Owners on user forums consistently report that a post-install alignment is required, and some found the rear camber and toe would not adjust fully on the factory toe control arms, which led them to fit adjustable arms.
This is a moderate-difficulty job for a home mechanic with a solid set of hand tools, a jack, jack stands, and spring compressors for the front struts. Owners on user forums estimate about two hours per front corner and four hours for the rear. Mark eccentric bolt positions before loosening anything, because the rear settings affect alignment. The rear job involves unbolting the axle and toe control arms, so most owners recommend a torque wrench and a clear plan before starting. Book an alignment shop visit immediately after the install.
