The H&R 29797-2 is a complete front and rear Sport Spring set for the C5-generation Audi A6 quattro (4B chassis, 1998-2004). It replaces the factory coil springs to lower the car and tighten the stance while keeping the factory dampers in place. H&R builds its springs in Germany from tempered spring steel and shot-peens them for fatigue life, so the set has a stronger material base than many budget lowering springs.
Compared with stock, the main reasons to buy are a lower center of gravity, a smaller fender gap on the 4B body, and a firmer, more responsive feel through corners. Owners on user forums describe the ride as stiffer than factory but livable day to day. Some owners on user forums warn that stock shocks wear faster once lowering springs go on, so if the car will see hard driving, budget for matched dampers. Drop varies from car to car, so confirm the exact figure with the manufacturer before ordering. Shoppers searching for 1998-2004 A6 quattro sport springs, C5 A6 lowering springs, or a 4B progressive coil spring kit will find this set matches that application.
The manufacturer's guidance on damper pairing was not confirmed in our research. Owners on user forums report that lowered cars on factory dampers can wear them out sooner, and many pair the springs with matched shocks for a more controlled ride.
Owners on user forums report that on cars with factory sport springs, the front can be swapped without a compressor. The rear is generally considered the harder job and usually requires a spring compressor.
Owners on user forums report results that differ from the advertised figure, and one owner with a non-sport suspension reported roughly 2 inches of drop after settling. Confirm the exact drop with the manufacturer before buying.
Owners on user forums describe the front as the easier side and the rear as the hardest part of the job, with one owner rating a comparable H&R set 9 out of 10 for difficulty. Plan on a full day, and budget 6 to 8 hours for a first-timer. Useful tools include a floor jack and stands, 16-21mm sockets, a torque wrench for wheel and subframe bolts, an Audi spreader tool (3424) for opening the strut extension, an impact wrench or breaker bar for the 18mm top strut nut, and a spring compressor. Common gotchas: disconnect the brake and sensor lines from their brackets so they have enough slack for the suspension drop, and have a helper on hand for the rear springs.
