The H&R Sport sway bar kit for 2009–2016 BMW Z4 sDrive30i/35i/35is (E89) includes a matched 27mm front and 21mm rear set to increase roll stiffness and reduce body roll while maintaining ride comfort. That balance improves cornering control, lateral stability and grip. Forged smooth ends allow stiffness adjustment on applicable vehicles. Most kits ship with H&R Poly/Teflon bushings to prevent squeaks and eliminate lubrication; bars are made from 50CrV4 steel in Germany.
H&R 09-16 BMW Z4 sDrive30i/Z4 sDrive35i/Z4 sDrive35is E89 Sway Bar Kit - 27mm Front/21mm Rear