BMW E91 E93 Rear Coil Spring BILSTEIN-36-313242

For E91 Touring and E93 Convertible owners chasing a precise, no-nonsense rear spring upgrade - not an OE replica, not a budget compromise, but a properly engineered fast-road or track-day spec spring that holds its rate and ride height.

• BILSTEIN-36-313242 - the exact part number enthusiasts search for on forums, group buys and spec sheets
• Fits E91 (325i, 330i, 330d, 335i, xDrive) and E93 (all variants) - no guesswork, no 'may fit' caveats
• Hot-set and surface-compressed to resist sag - critical for stage 1 or stage 2 builds where ride height consistency matters
• Chrome vanadium steel construction; corrosion-resistant finish tested in UK damp, not showroom gloss
• Pair-fitment recommended: because one wonky corner ruins the balance on a fast road run or track day lap
• Searches this answers: E91 rear spring, E93 coil spring, Bilstein B3 rear spring, fast road rear spring, track day BMW spring, stage 1 suspension upgrade