Two different aero designs. The Merc is designed to hold out the turbulent front wake just outboard of the driver where it is widest, then aggressively tapers back. This aims to bring clean energy around the mid line of the sidepod through the undercut to the rear. The Red Bull Racing design holds a very wide outboard wall that continues further back to keep the front Tyre wake out. While providing a clean pathway for high energy air to travel to the rear by following the water slide along the sidepod top surface. Two different approaches.