Vehicle rear underside structure

A rear underside structure of a vehicle, comprising:

• a rear undercover main body with an inclined planar part rising toward a rear of the vehicle, the rear undercover main body disposed beneath a drive element disposed further to the rear than a fuel tank between a front and rear axle so as to cover a rear under part of the vehicle including the drive element;
• an air flow path delineated by the rear undercover main body and the drive element, at least a rear part of which is delineated by the inclined planar part;
• an air intake opening disposed forward of the drive element;
• an air exhaust opening disposed to the rear of the inclined planar part, wherein air entering from the air intake opening passes through the air flow path, and is exhausted from the exhaust opening;
• a removably attachable fin on a bottom surface of the inclined planar part;
• and
• wherein the fin is softer than the rear undercover main body.

A rear underside structure of a vehicle, comprising:

• a rear undercover main body with an inclined planar part rising toward a rear of the vehicle, the rear undercover main body disposed beneath a drive element disposed further to the rear than a fuel tank between a front and rear axle so as to cover a rear under part of the vehicle including the drive element;
• an air flow path delineated by the rear undercover main body and the drive element, at least a rear part of which is delineated by the inclined planar part;
• an air intake opening disposed forward of the drive element;
• an air exhaust opening disposed to the rear of the inclined planar part, wherein air entering from the air intake opening passes through the air flow path, and is exhausted from the exhaust opening;
• a removably attachable fin on a bottom surface of the inclined planar part;
• and
• wherein the fin comprises a thick portion disposed near an edge at the rear of the vehicle and a thin portion disposed in front of the thick portion.