The carbon hood has a large vent to allow air from the radiator and intercooler to escape up and over the car instead of backing up in the engine compartment and leaking out of the wheel well area reducing unbody downforce generation.
The front fenders have large vents in them as well to prevent the build-up of high-pressure air on top of the tires.
Who says FWD cars don’t need rear aero? The PZ Civic uses a triple element rear wing and a large rear diffuser along with a keel and other advanced aero features.
The rear diffuser is pretty interesting, it uses a center keel, presumably to increase the diffusion without using vertical strakes and to utilize and direct flow to the cars unique internal diffuser tunnel, which is right above it better.
The exhaust which is made from Vibrant Performance titanium tubing exits on top of the keel where it probably has an effect on increasing the effectiveness of the diffuser.
The air in the region of the rear wheel wells has nothing to trap it, but there are inner and outer fences with the inner fence featuring a small gurney to prevent swirling wheel well air from interfering with the airflow in the rear diffuser.
The outer fence probably helps keep air curling around the back of the car from interfering with the rear diffuser flow and helps reduce wake drag.