An assembly for a vehicle includes a front subframe having two frame rails and a control arm connector on each frame rail. The assembly includes a panel supported on the frame rails and spaced vehicle-rearward of the control arm connector. The panel extends cross-vehicle from one of the frame rails to the other of the frame rails. The panel includes a channel elongated along the vehicle-longitudinal axis. The assembly includes a vehicle component spaced vehicle-rearward of the panel. The channel is aimed at the vehicle component.