BMW X3 E83 Front Coil Spring Bilstein B3 37-239817

Bilstein B3 front coil spring 37-239817 for the E83 X3 (2003-2011) - not a generic 'OEM replacement', but the actual B3-spec spring used in stage 1 fast road and track day builds where you want predictable, linear response without coilover complexity.

Works with all E83 engines: N46, N52, M54, M47, N47 - including 2.0i, 2.5i, 3.0i, xDrive 20d, 25i, 30i, 3.0si. No fitment guesswork. No VIN checks needed - this part is chassis-coded to E83.

• Hot-set & surface-compressed - zero initial sag, consistent ride height over time
• Pigtail ends + central force design - eliminates coil bind and noise on full compression
• Made from chrome vanadium steel, corrosion-coated for UK weather resilience
• Fits stock top mounts and standard E83 front struts - ideal for fast road, track day or daily driver use where you need reliability, not just drop

Search terms covered: X3 E83 front spring, Bilstein 37-239817, E83 fast road suspension, stage 1 X3 coil spring, Bilstein B3 E83, track day X3 front spring.