E81 E82 E87 E92 BMW Bilstein B3 Rear Coil Spring 36-313273

Bilstein B3 rear coil spring (part 36-313273) for E81, E82, E87 and E92 chassis - not a copy, not a rebrand, not an 'OE replacement'. It’s the genuine Bilstein B3: hot-set chrome vanadium steel, pigtail ends, surface-compressed, built to hold ride height on fast road, track day or daily driver duty.

• Search terms this matches: E87 rear spring, E92 M3 non-M spring, E82 135i rear coil, E81 120d fast road suspension, stage 1 BMW coilover base, decat + lowering combo, B58 prep spring (where applicable), N54/N55 rear spring upgrade
• Fits: All E81 (116i-130i, 116d-120d), E82 (120i-135i, 118d-120d), E87 (116i-130i, 116d-120d), E92 (316i-330i, 320d-330d) - including pre-LCI and LCI. Not for M3/M4 (G80/G82), not for F20/F30.
• Why it matters: Stiffer than stock, linear rate, consistent rebound control. Pairs cleanly with B12, B14 or B16 coilovers - or stands alone as a precise, no-nonsense fast road upgrade. No sag. No guesswork. Because race car.