XYZ Racing Circuit Master Coilovers — BMW 4 SERIES F83 M4 (Cancellation Kit for Electronic Damping) 2014-2020

The F83 M4 Convertible carries an extra 60kg of folding-roof hardware over its F82 coupe sibling, and that mass sits high and aft of the rear axle line – exactly where you don’t want it on corner entry. The Circuit Master is built for owners who’ve decided the factory Adaptive M setup, even in its stiffest mode, isn’t holding the body still enough for repeat sessions at Donington or Snetterton. This kit ships with the electronic damping cancellation harness, so the dash stays quiet once the OEM struts come out.

For a 425bhp S55 twin-turbo six on slicks or semis, the priority is platform discipline: stopping the nose diving under threshold braking at the end of the Hangar Straight, then keeping the rear loaded through the transition into Stowe. The Circuit Master is the XYZ range’s circuit-specific damper, and the F83 chassis is where its weight-bias correction earns its keep.

What this coilover does for your 2014-2020 Bmw 4 Series F83 M4 (Cancellation Kit for Electronic Damping)

The F83’s stock damping was tuned for a broad GT brief – comfortable to Cannes, capable at Cadwell. The Circuit Master strips that compromise out. With 9720 distinct damping permutations available through the three-knob adjuster system, you can run a softer high-speed bump setting for kerbs while keeping low-speed compression firm enough to stop the front splitter scraping under braking. Body roll falls off sharply, which matters on the Convertible because the chassis is already working harder to resist torsional flex than the coupe.

Ride height drops to your chosen window, planting the wheel inside the arch and reducing the centre-of-gravity penalty the folding roof imposes. Turn-in becomes immediate. Mid-corner, the rear stops squatting under the S55’s torque delivery, so the diff can put power down cleanly out of slow corners like the Melbourne hairpin.

About the Circuit Master coilover

The Circuit Master sits at the top of XYZ Racing’s competition tier, alongside the Racing Spec, Drift Spec and Tarmac Rally variants. It’s a circuit-specific damper developed and signed off by XYZ race teams running internationally, with long-duration testing on competition surfaces rather than B-roads. The headline figure is 9720 distinct adjustment combinations, delivered through three separate knobs that govern compression and rebound across the damper’s working range – high-speed bump, low-speed bump, and rebound.

The three-knob architecture uses a small-oil-passage design. On big single hits – a kerb strike or a deep compression – fluid is forced through a restrictive orifice, which can produce a faint mechanical note. That’s expected behaviour from the valving choice and not a fault; it’s the trade-off for the granularity of adjustment the circuit specialist demands. The damper is built to live on track surfaces, where ride feel over potholes was never on the brief.

Fitment for the Bmw 4 Series F83 M4 (Cancellation Kit for Electronic Damping) (2014-2020)

Chassis code BM94-C, covering F83 M4 Convertible production from 2014 through 2020. This SKU includes the cancellation kit required to retire the factory Adaptive M Suspension control unit, so the dash won’t throw an EDC fault once the originals are removed.

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Pick your spec, ride-height window and any optional camber plates below to configure the kit for your F83.