KW HAS Height Adjustable Lowering Spring Kit for BMW 4 Series M4 (G83) Competition Convertible 2021+ | EDC/Adaptive M Damper Compatible | Front & Rear

KW Suspension HAS variable ride height spring set for BMW M4 G83 Competition Cabriolet 2021 onwards

Give your G83 the stance and composure it deserves. This KW Suspension HAS system delivers coilover-style ride height tuning while keeping your original active shocks and factory electronics intact. Expect a lower centre of gravity, tighter body control and crisp steering feel with everyday comfort for UK roads.

If you are searching for a premium suspension drop kit for the BMW M4 convertible that works seamlessly with the OE adaptive shock absorbers, this is the trusted solution. Set your ride height precisely at both axles, fine tune the rake, and enjoy a purposeful look with genuine performance gains on fast road or occasional track use.

Highlights

• On-car ride height adjustment at both ends for the perfect stance and setup
• Retains OE active damping and factory control functionality
• Sharper turn-in, flatter cornering and improved stability at speed
• Threaded spring perches for precise, repeatable height changes
• High quality KW components designed for durability in real UK weather
• Coilover feel without replacing your original dampers

Compatibility

Vehicle: BMW M4 Competition G83 Cabriolet, 2021 onwards. Works with the original electronically controlled dampers and standard control modules. Adjustable spring assemblies for both front and rear axles.

What you receive

• KW HAS front spring assemblies with threaded adjusters
• KW HAS rear spring assemblies with threaded adjusters
• Vehicle-specific bump stops and dust protection
• Installation instructions

Proven on customer cars

We have fitted this kit to multiple G83 builds and the feedback is consistently positive. Owners love the precise height control, the planted feel through quick direction changes and the refined ride that pairs perfectly with the factory adaptive system. It looks right and drives better.

Engineering you can trust

KW develops vehicle-specific spring rates to work harmoniously with the M4’s OE damper curves and axle loads. The result is a balanced, controlled ride with long-term reliability thanks to corrosion-resistant hardware and protective sleeves designed to cope with British road conditions.

Professional installation and setup

For the best results, we recommend professional fitting followed by a full four-wheel alignment to optimise handling and tyre wear. MJ Modifications offers installation and geometry services in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Why choose HAS over fixed drop springs

• Dial in the exact ride height after install for wheels, tyres and aero
• Keep the sophistication of the factory adaptive suspension
• Achieve a credible coilover alternative while retaining OE dampers
• Set the perfect fast-road or track day stance with easy future adjustments

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Order with confidence — trusted brand, proven results and expert support from MJ Modifications.