H&R 27mm Front / 19mm Rear Sway Bar Kit | BMW 525i/530i/545i/645Ci Convertible (04-11) (72460)H&R Sport Sway Bars for your 2005 2011 BMW 645Ci Convertible w o Dynamic Drive (E64) are designed for drivers who desire improved handling without lowering or affecting ride quality. H&R Sport Sway Bars increase your suspension's roll stiffness or its resistance to roll in turns while maintaining ride comfort and dramatically increasing cornering control, lateral stability, and grip. A unique feature of H&R Sport Sway Bars are the smooth, machined