Sway Bar affects the handling and the car’s over steer and under steer. It ties the lower suspension links together across the front or back, will keep your car flat in turns instead of leaning over to one side. Hardrace sway bars provide better control especially at high speeds cornering . Designed for OE direct replacement . Hollow internal structure . Heat treated . Correction of under or oversteer . Improve more grip and better handling . Increased stability while during high speed cornering  Note: 19 mm 5 PCS/SET Only for 5' F10 2010- use Only for 6' F12/13 2011- use  Fits: BMW 5 Series F10/F11 2010-2017 BMW 6 Series F06/F12/F13 2011-2018