AVO S1X03E1GV002T Suspension Front Lower Control Arm Bushing (+0.00 Caster Adj, 05-09 Legacy / 08+ Impresa) The stock bushings in the front lower control arm on current Subaru models is one of the weakest points of their suspension design This lower control arm rides on a large round bushing at the rear, which provides most of the support for the lower control arm The reduced back pressure of the AVO exhaust system as a whole gets rid of the terrible dip in the torque curve, and the improved flow increases performance