Configurable rear underbody aerodynamic diffuser

A rear underbody aerodynamic diffuser for a rear underbody of an automobile comprising:

• a plurality of vertical panel strakes designed to extend from a rear underbody of the automobile in a street configuration;
• a plurality of rigid vertical panel extensions comprising extension coupling elements designed to removably couple the vertical panel extensions to the plurality of vertical strakes in a track configuration;
• wherein the rear underbody aerodynamic diffuser is designed to be reconfigurable between the street configuration and the track configuration and vice versa;
• wherein, when the rear underbody aerodynamic diffuser is in the street configuration, the plurality of vertical panel extensions are uncoupled from the plurality of vertical panel strakes and the vertical panel strakes have an overall width that extends a vertical street distance;
• and
• wherein, when the rear underbody aerodynamic diffuser is in the track configuration, the plurality of vertical panel extensions are removably coupled to the plurality of vertical panel strakes and the combined vertical panel strakes and vertical panel extensions have an overall width that extends a vertical track distance that is greater than the vertical street distance.