Splitter

Splitter is a horizontal aerodynamic surface mounted at the front of a car, typically extending forward from the front bumper. Airflow above the splitter is forced upward (creating downforce on the front axle), and airflow below the splitter is accelerated and channeled under the car. The pressure differential creates downforce specifically at the front of the car, balancing rear downforce from a wing or diffuser.

Splitter design is sensitive. The splitter must be wide enough to capture meaningful airflow but not so wide that it scrapes on driveways or speed bumps. Most splitters use stiff carbon fiber or fiberglass construction with reinforcing rods to prevent flexing under load. Aggressive splitters with extensive forward extension (sometimes called "shark tooth" designs) generate more downforce but are more vulnerable to damage.

Modern road cars with significant splitters include the Porsche 911 GT3 RS, Lamborghini Huracan STO, Ford Mustang Shelby GT500, and BMW M4 CSL. Track-focused builds often add larger aftermarket splitters for additional front downforce, balancing the rear wing setup. The choice of splitter size depends on intended use: bigger for track, smaller for daily-driven sport cars.