This Bilstein B8 (SP) front right strut is a complete 36mm monotube assembly from Bilstein's sport-tuned B8 line, so you get a replacement damper for the driver's side of the front end without sourcing the parts separately. It is built for the BMW E90 3 Series chassis, which means it targets the sport-sprung and lowered setups these owners commonly run. Compared with worn factory struts, a monotube damper with sport valving can hold a firmer, more controlled body on corner entry and exit, and it is a logical choice for a street car that sees occasional canyon or track use without the harshness of a race-only unit.
Pulling the old strut on an E90 is a real job rather than a quick bolt-off. Owners on user forums describe spreading the knuckle pinch with a chisel or punch, using a jack under the control arm to ease reinstallation, and tightening the upper strut nuts to roughly 26 ft-lbs. Keep the brake hose and pad sensor line on the inside of the new strut during installation, or you will have to pull it again. Searches for BMW E90 325i front strut upgrade, 335i sport strut replacement, and 36mm monotube front right strut will lead you to the fitment details that matter most.
Owners on user forums say it is not strictly required, since the strut can be worked out of the fender by releasing the top nuts and pushing the brake assembly aside. Loosening the control arm makes the job easier, according to the same discussions.
Owners on user forums report tightening the upper strut nuts to about 26 ft-lbs. Confirm the value against the manufacturer's current service documentation before final torque.
This is an intermediate job that needs a floor jack, jack stands, a spring compressor if you are transferring the top hardware, a torque wrench, and a chisel or pry bar to spread the knuckle. Plan on disconnecting the sway bar link and, on many E90s, the tie rod end to drop the knuckle. Clean the strut mount and bearing surfaces, and expect the knuckle to be stubborn; penetrating lubricant helps. Owners on user forums suggest replacing the strut and checking the mounting hardware in one session so the alignment is set once.
