Whiteline 08-13 BMW M3 30mm Front Heavy Duty SwaybarBrand Whiteline Part Number BBF46 Category Suspension Sway Bars Condition Brand New Original Manufacturer Packaging Engineered to 'Activate More Grip', sway bars are principally designed to reduce body roll or sway. By reducing body roll, lateral loads are spread more evenly across the tyres thereby increasing cornering grip and improving outright performance. This Whiteline 30mm fixed position sway bar = more grip = better handling = outright