The Bilstein B4 19-170084 is a rear shock from the brand's B4 OE Replacement line. Bilstein's B4 dampers use gas pressure technology to eliminate oil foaming and fade, which helps a replacement hold its damping under repeated use. A budget rear shock may feel acceptable when new, but the B4 is aimed at restoring the factory ride on a worn Audi TT (8J) chassis. The manufacturer's OE cross-reference lists 8J0 513 029 part numbers for matching the original application.
Fitment is the first thing to confirm. This listing is written for cars without Magnetic Ride suspension or Electronic Damper Control, and a TT S is generally expected to carry Magnetic Ride. Owners on user forums say Bilstein told them its products are not designed for magnetic suspension, so check your car's suspension configuration before ordering. On a qualifying car, the job is more straightforward. Removing the wheel-well liner gives access, and the shock is secured by two bolts at the top and one large bolt at the bottom. Owners on user forums say the springs do not need to come off. Search terms this part targets include B4 rear shock 2008-2015 Audi TT, 8J rear damper replacement, and non-Magnetic Ride TT shock.
No. The application data for this part excludes cars with electronic suspension. Owners on user forums report that Magnetic Ride dampers also use an electrical connector, so confirm your car's suspension equipment with the manufacturer before ordering.
According to owners on user forums, no. The shock can be removed and installed with the spring left in place, which is why many owners treat this as a bolt-on job.
Owners on user forums recommend new bolts when reinstalling the shock, although many skip this step. Replacing both rears together is also commonly advised.
This is a moderate-difficulty, one-wheel-at-a-time job for a home mechanic. Owners on user forums recommend a jack, sturdy stands, a ratchet with a long extension, and Torx bits for the wheel-well liner. Lift the car and support it on stands rather than using a suspension component to hold the wheel. Keep a block under the hub, since the shock is holding the suspension up while the wheel is off the ground. Use new mounting bolts, and check the car's electronic suspension equipment before buying.
