BILSTEIN 19-214320 Shock absorber rear B4 (R1) BMW 3er E90 M3 ymm_77 PowerPak Plus pistons include a

PowerPak Plus pistons include a hard anodized top ring groove for extreme duty applications

Description JE JG86F1-4500-5 Piston Ring Set (4

which are threaded prior to heat-treating

Replacement Filter: RU-1037

we then did a dyno pull from this point

BILSTEIN 19-214320 Shock absorber rear B4 (R1) BMW 3er E90 M3 ymm_77 PowerPak Plus pistons include aDescription BILSTEIN 19 214320 Rear Shock Absorber B4 OE Replacement The Bilstein B4 is designed as an ideal OE replacement shock absorber. Its specifications and function match the original equipment, and it is manufactured to the same quality standards as OE, making it suitable for reliable replacement of the original shock absorber. The Bilstein B4 restores the vehicles original handling characteristics, providing a driving experience similar to