Rear Apron Panel + Rear Diffuser

The rear diffuser runs the full length of the car's underside, with vertical fins that stabilize airflow as it exits behind the vehicle. As underbody air transitions from the low pressure beneath the car back to atmospheric pressure, that expansion zone is where flow separation typically happens — the fins manage that transition by spinning up vortices instead of letting it turn turbulent, protecting the downforce the rest of the underbody worked to create.

The fins bolt on individually, so if one gets damaged you replace just that fin rather than the whole diffuser — a practical detail for a part that lives this close to the road. The apron panel completes the look with a finished, factory-integrated appearance.

The Numbers

Paired as a complete system, the full 992.2 GT3 aero kit increases downforce by 21% over stock for roughly a 1% drag penalty, based on CFD simulation at 180 km/h (112 mph), while holding the GT3's original front-to-rear balance. In raw terms, that's 244N (55 lbs) of load at that speed — but downforce isn't ballast. It presses the tires into the road without adding weight the car has to carry through a corner or haul down under braking, and it builds with speed, so there's more of it exactly when you're leaning on the car hardest. That's balanced grip you can actually use, with almost no loss of straight-line speed.