ST X Coilover Suspension Kit for BMW Z4 E85/E86 Roadster & Coupe (2003-2008) – Height Adjustable Lowering 20–50mm Front, 15–40mm Rear – Performance Shocks & Springs Upgrade by KW

Transform your BMW Z4 ride and handling with ST height-adjustable suspension

Give your BMW Z4 Roadster or Coupe from 2003 onwards the stance, control and confidence it deserves with this ST X height-adjustable suspension kit. Built by KW Automotive in Germany, this complete spring and damper package delivers sharper steering response, reduced body movement and a purposeful drop without ruining day-to-day comfort. It is the ideal fast-road suspension upgrade for owners who want precise ride height control, dependable build quality and real-world performance.

We run ST on our own cars and our customers consistently praise the balance, ride quality and grip. If you want a clean, even drop with proper handling gains, this kit is a brilliant choice.

Lowering range for this application

• Front drop: 20 to 50 mm
• Rear drop: 15 to 40 mm

Permissible axle loads

• Front maximum axle load: 790 kg
• Rear maximum axle load: 890 kg

Why enthusiasts choose this ST setup

• Adjustable ride height via a robust composite collar for accurate stance and corner balancing
• Galvanised threaded bodies with additional coating for strong corrosion protection
• Twin-tube damper design for dependable road comfort and confidence at speed
• Chrome-plated piston rods and pressure-resistant internals for long service life
• Multi-lip seal package and guided piston design to keep performance consistent in all weather
• Complete kit with adjustable spring seats, matched performance springs, bump stops and dust covers
• Engineered and manufactured by KW Automotive for proven durability and dynamics

Perfect for

BMW Z4 owners seeking a sportier, lower look with real handling benefits. Ideal for street performance, spirited B-road driving and daily use where precision, stability and comfort matter.

Popular search terms this kit matches

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Professional fitting

Want it installed right first time? Book professional fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Note: Please verify your vehicle’s axle loads before purchase to ensure compatibility.