The Bilstein B6 34-000403 is a front monotube strut cartridge from the B6 Performance line. It is built to replace the damper internals of an existing Porsche 944 front strut rather than the whole assembly, so the owner can keep the original spring and strut housing. Owners on user forums describe this insert route as a practical way to refresh worn front dampers, with the B6 chosen over a complete strut because it avoids a full strut purchase. Expect a firmer feel than stock. One owner on a user forum said the B6 inserts felt much stiffer than anticipated, so this suits buyers who want a sharper, more controlled front end for spirited street driving or occasional track days.
Fitment depends on the strut housing, not just the model year. The listing covers 1983 to 1991 Porsche 944 models, but owners on user forums report that early 1983 to 1986 cars with a screw-off top cap accept the insert directly, while 1987 and later cars with sealed housings require cutting the strut and welding in an adapter, so this is a fabrication job. Listing data also ties this part to OE Boge-equipped struts, and details vary between sources, so confirm your strut type with the manufacturer before ordering. Because this is a special-order item with a 12-week lead time, verify fitment before committing to the purchase.
Owners on user forums report that early 1983 to 1986 struts with a screw-off top cap take the insert directly. Later sealed housings, from about 1987 onward, require cutting and welding an adapter, so confirm your strut type before ordering.
Owners on user forums report keeping the original springs with B6 inserts. They advise inspecting the factory springs for severe corrosion or cracking before reusing them.
Owners on user forums say the threaded collar must be seated fully and tightened to the specified torque. One owner bought a Bilstein-branded tool for this job.
This is a moderate to advanced DIY job, not a simple bolt-on. Owners on user forums describe compressing the spring, then removing the lower bolts and the upper nuts before pulling the strut. Rusted fasteners are a common gotcha; one owner reported spending about two hours freeing a single strut. On 1986 cars, owners mention a 22mm nut on top of the housing and a threaded cap under the dust boot that is the old insert's internals, which must be removed before the B6 can seat. Check the insert's top fits the housing before final assembly, torque the collar to specification, and plan a wheel alignment afterward. If your car has sealed housings, budget for a shop with strut fabrication experience or consider a complete strut assembly instead.
