The Bilstein B4 22-170071 is a single front OE-replacement strut assembly intended for the Audi TT Mk2 (8J) platform. The manufacturer builds its B4 line to original-equipment standards in the same plants as its OE shocks, aiming to match the factory part's tuning and fit. If you want the car's original ride height and damping character back rather than a firmer setup, this is a direct-fit replacement built around that goal.
Compared with a bargain strut, the B4 justifies its price through factory-matched behavior. The manufacturer presents it as the option that restores the ride, handling and safety the car had when new, while its B6 is the firmer, tuned alternative for sharper body control. Worn struts lose damping control, so a fresh assembly helps steering and braking feel stay predictable. Owners on user forums often renew the top mount and bearing at the same time, a worthwhile add-on to budget with this strut.
Fitment is the main thing to verify. Sources disagree on drivetrain (FWD versus quattro) and model years, so confirm application against your VIN and check with the manufacturer before ordering. If you run lowered springs, confirm compatibility first, since this part is aimed at factory-height setups. Long-tail searches this part serves: Audi TT Mk2 8J front strut replacement, Bilstein B4 OE front strut 22-170071, factory ride height TT strut, 8J TT OE-spec damper.
Fitment information is inconsistent across sources, so confirm the application with the manufacturer using your VIN before ordering.
The manufacturer describes the B4 as a straight OE replacement that restores factory ride height and tuning. The B6 is an improved OE replacement with firmer, Bilstein-tuned damping for sharper body control.
Owners on user forums advise replacing the bearing race at the same time as the strut mount. They also note the spring must be compressed before the mount can be removed.
Owners on user forums describe this as a demanding job rather than a quick swap. Plan on a safe lift or jack stands, a trolley jack to support the hub, and sockets including 13mm and 18mm, a 21mm for the upper nut, a hex bit for the center stem, and an M14 triple-square bit for the lower bolt. Watch for a few gotchas: the lower bolt uses a triple-square head, the top mount uses small bolts, and the captive nut under the mount can spin freely, so hold it. Use a hex tool to keep the rod from turning while you torque the top nut, which forum posts put around 60 Nm (44 ft-lbs). Replace any torque-to-angle fasteners, as forum consensus advises. Budget for a four-wheel alignment afterward, since strut replacement changes camber and caster settings.
