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The H&R Sport sway bar kit for 2003–2008 BMW Z4 (E85) pairs a 27mm front and 21mm rear bar to reduce body roll and improve cornering precision while maintaining ride comfort. Matched bars increase roll stiffness and lateral grip for more confident handling transitions; most kits include H&R’s Poly/Teflon bushings to prevent squeaks and eliminate lubrication requirements.
H&R 03-08 BMW Z4 E85 Sway Bar Kit - 27mm Front/21mm Rear
