Eibach BMW M2 F87, M3 F80 & M4 F82 Anti-Roll Bar Kit (2014-2021)The Eibach anti roll bar kit for the BMW F80 M3, F82 M4 and F87 M2 reduces body roll when cornering and improves stability during fast direction changes. This is an essential upgrade for track driving. The suspension system anti roll bar helps control the lateral and centrifugal forces This reduces body roll while cornering or making fast directional changes The system uses the outside cornering spring rate along with the rate of the anti roll bar