Racing Dynamics Front Strut Bar 1997-2003 BMW 540i (E39)Strut Brace, front, BMW 5 series 540i 1997 2003 chassis series e39. Each Racing Dynamics strut brace was design by professional race car engineers for chassis stiffness and ease of mounting. Each strut brace is designed using our specially designed extrusion for increased stiffness and properties to allow bending of the alloy without crimping at the bends or need to cut and weld multiple pieces (an inherently weaker design). Each movable joint is