Bilstein B12 Pro-Kit Spring & Damper Kit for BMW 4 Series F33 Convertible/Cabriolet 2014–2018 (430d 435i 440i) – Fixed-Height Sport Lowering Suspension up to 50mm – Shocks & Springs Drop Kit, Coilover Alternative – Part No. 46-258199

Bilstein B12 Spring and Damper Package for BMW F33 Cabriolet 430d 435i 440i

Give your BMW 4 Series F33 cabriolet the handling edge and road presence it deserves with this Bilstein B12 fixed-height performance package. Designed as a premium shocks and springs upgrade, it delivers a purposeful ride height drop, sharper turn-in and a composed, confidence-inspiring drive on British roads. Ideal if you are searching for a BMW F33 suspension kit, sport shocks and lowering springs combo, fast-road handling pack or a coilover alternative for daily use.

We have installed this kit on customer F33 builds and the feedback has been outstanding. Tighter body control, improved stability through bends and a clean, even stance that looks factory-plus without compromising everyday comfort. It is a brilliant street-focused chassis upgrade for 430d, 435i and 440i soft-top models.

Key reasons enthusiasts choose this setup

• Direct-fit spring and damper set engineered for the BMW F33 cabriolet 430d, 435i and 440i.
• Ride height reduction of up to 50 mm depending on application for a more aggressive, level stance.
• Matched gas-pressure dampers and performance springs for balanced control and real-world comfort.
• Reduced roll and pitch with crisp steering response and planted high-speed stability.
• Refined fast-road dynamics while remaining perfectly usable for daily commuting.
• Quality components from a leading OE-supplier for long-term durability.

What this performance suspension delivers

The Bilstein B12 package pairs sport-tuned dampers with precisely rated springs to bring your BMW 4 Series convertible lower to the tarmac while maintaining correct geometry and usable ground clearance. Expect confident cornering, better grip over uneven surfaces and a composed ride on A-roads, B-roads and motorways. If you are comparing BMW F33 lowering springs alone vs a complete shocks and springs kit, this is the proven fast-road solution that keeps comfort in check.

Compatibility

• BMW 4 Series F33 Cabriolet 2014 to 2018
  • 430d
  • 435i
  • 440i

Part number

46-258199

Why buy from us

We run this suspension on customer cars and the results speak for themselves: smoother body control, enhanced traction and a tidy, even drop that transforms the look and feel of the F33 cabriolet. Our BMW community rates this kit highly for its fast-road capability and daily drivability.

Professional fitting and alignment

For the best outcome, have this spring and damper kit fitted and aligned by specialists. MJ Modifications in Warwickshire can supply, install and set up geometry to suit your use. Request a fitting quote at info@mjmodifications.co.uk.

Helpful search terms

BMW F33 cabriolet suspension kit. BMW 4 Series drop kit. BMW 430d shocks and springs. BMW 435i handling upgrade. BMW 440i sport suspension. Fast-road suspension pack. Fixed-height performance suspension. Coilover alternative for BMW F33. Bilstein B12 46-258199. Lowering springs and dampers for BMW 4 Series convertible.