Eibach BMW G20 & G21 3 Series Anti Roll Bar KitThe Eibach anti roll bar kit for the BMW G20 & G21 3 Series reduces body roll when cornering and improves stability during fast direction changes. This is an essential upgrade for track driving. BENEFITS 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