S Wave - Anti Roll Bar - Rear 22mm - GR SupraS Wave Anti Roll Bar for GR Supra Rear S Wave 22mm OEM 18mm Complete with bushes, brackets S Wave signature orange powder coating The fitting of larger sway bars has two main effects, vehicle balance in terms of understeer and oversteer, and increased roll resistance. Both of these can provide increased overall grip levels that can be achieved by the vehicle.