BMW F33 F36 4 Series Coilovers - ST Suspension ST X Coilover Kit (2014-2020) 428i 430i 435i 440i - Height Adjustable, KW Engineered - RWD Non-xDrive, No EDC - 1322000J

ST Suspension ST X Sports Suspension for BMW F33 Convertible and F36 Gran Coupé 428i, 430i, 435i, 440i

Transform your 4 Series with a premium ride-height adjustable suspension package that delivers real-world performance on UK roads. The ST Suspension ST X system, developed with KW Automotive know-how, sharpens steering response, reduces body roll and gives you the stance you want with everyday comfort. Ideal for road enthusiasts who want confident handling, precise height control and a clean, even drop on a rear-wheel-drive F33 or F36 without adaptive dampers.

What you can expect

• Ride-height adjustability using a continuous thread design for millimetre-precise setup
• Lowering range front and rear approx. 35 to 65 mm (about 1.6 to 2.5 inches) for a balanced, aggressive look
• Polyamide adjuster rings for easy in-situ height changes
• Galvanised steel struts with additional corrosion protection for long-term durability in UK weather
• Twin-tube damping with chrome-plated piston rods for sporty control and road comfort
• Complete package: performance springs, dampers, adjustable spring perches, bump stops and dust boots
• Engineered in collaboration with KW for confident cornering, improved traction and reduced body movement
• Backed by a 2-year manufacturer warranty

Real results from MJ Modifications

We have installed this set-up on customer 4 Series builds and on our own cars. Feedback is consistently positive: compliant on daily commutes, composed on B‑roads, and a serious improvement in road holding with a tidy, even drop. It is our go-to street performance suspension when you want quality, reliability and a stance that looks right without compromising drivability.

Vehicle application

• BMW 4 Series
  • F33 Convertible, 2014 to 2020
  • F36 Gran Coupé, 2014 to 2020
  • Petrol models: 428i, 430i, 435i, 440i

Fitment notes

• For rear-wheel-drive models only, not suitable for xDrive
• Not for cars with EDC or adaptive electronic damping
• With factory wheels and tyres, spacers may be required for clearance

Lowering range

• Front: approx. 35 to 65 mm (about 1.6 to 2.5 inches)
• Rear: approx. 35 to 65 mm (about 1.6 to 2.5 inches)

Construction

Galvanised steel body with extra corrosion protection, twin-tube damper technology, polyamide height adjusters and high-quality springs.

Part number

1322000J

Professional installation

For the best results and geometry setup, book fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Why this upgrade stands out

If you want your F33 or F36 to sit lower, corner flatter and feel more direct without harshness, this ST Suspension package hits the sweet spot. You get confidence-inspiring handling, improved turn-in and a tidy stance, all backed by KW-derived quality and everyday usability.

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