aFe Control Sway Bars are constructed out of lightweight tubular material to transform handling and inspire driving confidence. Cornering will be flatter and neutral in any corner. The 29mm rear bar is constructed from lightweight tubular steel and is 2 position adjustable through precision CNC machined, TIG welded bar ends for a perfect fit. The kit includes direct? polyurethane bushings. For years of durability and great looks, the front sway bar is powder-coated a special 2 stage tangerine orange and are a direct fit and require no modifications. aFe Control front sway bars will have your 335i handling just as good at the track as it will around town. aFe Control Rear Sway Bar BMW 3-Series (F30) / 4-Series (F32/33) L4-2.0L (t) B58/N20/N26 / L6-3.0L (t) B58/N55 BMW 3-Series (F30) / 4-Series (F32/33) L4-2.0L (t) B58/N20/N26 / L6-3.0L (t) B58/N55