Megan Racing BMW Z4 2002-2008 Race-Spec Strut Tower Bar Front upper (EXC Z4M) - MR-SB-E85FU-1POne Piece Race Spec Strut Tower Bar constructed of strong Aluminum to extremely tight tolerances and then polished to perfection. Designed for BMW E85 to decrease body roll, this bar ties the chassis from left to right at critical stress points (Between the shock strut towers). As you drive and maneuver, your car undergoes many different forces that the chassis of the car absorbs; the brace helps to absorb the energy and directs these forces into your