1: Coilover suspension

Coilovers lower the car and are stiffer than stock. They provide better damping and more grip.

2: Spherical rear toe arms

Spherical rear toe arms allow settings beyond the factory specification for track use. They stabilise the rear and maximise cornering grip.

3: Front caster arm spherical bearing

Front arm spherical bearings replace the OEM bushing and prevent it from deforming under load. They provide stable, precise geometry and better feedback to the driver.

4: Solid subframe bushings or sleeves

BMW has used them since the M3 E92 GTS and later on the M2, M3 and M4 F8x. They prevent movement between chassis and subframe and help stiffen the rear axle.

5: Lower control arms

The lower control arms replace the pressed-steel arms, which are too flexible to handle the loads from high-performance semi-slick tyres (AR1, DZ03g, Trofeo R, Cup2…).

6: Adjustable anti-roll bar end links

They remove any residual preload in the anti-roll bars after corner weighting.