The H&R 29513 is a four-spring sport kit for the 1998–2004 Porsche 911/996 C2 Coupe in rear-wheel-drive (2WD) form. Fits C2 2wd model only. The coils use a progressive rate coil design, which stiffens cornering response while keeping daily comfort. H&R makes them from 54SiCr6 spring steel, shot-peens them for longer fatigue life, and applies a thick powder coat for corrosion resistance. Published drop figures vary by source, but one common listing cites about 1.25 inches front and rear, which closes the fender gap and lowers the car's center of gravity. Because the kit is TÜV-tested and built at H&R's ISO 9001 plant in Germany, you get documented production quality rather than an unverified generic spring. Searching for 996 C2 coupe sport springs, H&R 29513, or progressive-rate 911 lowering springs should bring up this exact kit.
These springs are designed to work with factory shocks or aftermarket dampers that fit stock springs. In practice, owners on user forums report that a factory-damper setup can ride bouncy, and many pair the springs with Bilstein B8 dampers for a settled ride. Expect to re-check alignment after lowering: forum owners note that camber becomes hard to bring back to factory specs and that the front and rear axles often need a tailored street setting to protect tire wear. The coupe kit is distinct from the Cabriolet/Targa kit, so match the part number to your body style before ordering.
The manufacturer's part numbering assigns the Coupe kit (29513) and the Cabriolet/Targa kit (29513-2) separately, so confirm your body style before ordering.
The manufacturer states the springs work with factory shocks or aftermarket shocks that fit stock springs. Owners on user forums, however, often describe the ride as bouncy on stock dampers and recommend upgrading to Bilstein B8 units at the same time.
Owners on user forums describe this as a full-tool job that is manageable for a capable DIYer with a helper. The one special tool they mention is a 21mm strut nut tool, which holds the strut while you loosen the top nut. Plan on a torque wrench, a 1/2-inch drive set for the caliper bolts (torqued to about 68 ft-lbs per one owner's write-up), and penetrating oil for the seized fasteners. Owners report the springs do not require trimming the bump stops, and that the shorter spring means a spring compressor is not needed to reinstall the strut mount. Support the caliper rather than letting it hang from the brake line, and get the strut mount arrows oriented outward before reassembly. Get a four-wheel alignment afterward.
