The phrase "aerodynamic improvements" refers to making changes or adjustments to a vehicle or object to make it move more easily through the air. Full definition
Notable aerodynamic improvements include new side skirts, a rear spoiler, and a new diffuser for the rear bumper with an integrated chrome exhaust pipe. (auto.ndtv.com)
Also, the cooperative application of active aerodynamics and modern styling led to a nine percent aerodynamic improvement on the new truck. (iimediaevents.com)
Differentiating it from the standard car is the bright blue paint scheme, yellow headlights, and a selection of aerodynamic improvements such as a new front splitter, side skirts and a larger rear wing. (gtchannel.com)