Shims can be inserted at this joint in the lower control arm like all late model GT and cup cars for rough camber adjustment.
This eccentric at the top outer pivot of the upper control arms allow for fine-tuning of the camber. You can see the double shear mounting of the upper ball joint. You can also adjust the steering axis inclination angle here as well. The GT3 has race car levels of adjustment in the front suspension.
The 992 GT3 also has a lot of innovative under-car aero going on. The GT3 has up to 150 percent more downforce than its predecessor depending on how it is adjusted. When in full downforce condition, it even has more downforce than the 991 GT3RS. These air guide vanes are very close to the ones done on the Hoonipigasarus. The new GT3 like the 991 GT3 has a flat bottom but the 992 is even flatter, with the entire bottom of the car covered with flat panels. The 911 had panels that covered the parts of the bottom that were not flat but some of the original floor was still visible even though it was nearly perfectly flat.
These vanes and wheel well shelves help strip air off the rotating tire as well as divert air from the wheel well area to the outside of the car. This helps improve the effectiveness of the front diffuser and reduces the pressure in the wheel well. The vanes prevent airflow falling from the sides of the car from curling under it and energizes the airflow in the center of the floor to improve the effectiveness of the rear diffuser.