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P3 is for prototypes with small naturally aspirated engines, with similar design freedom and the following specifications:
Up to 1.507 cm³ (bike engine): 450 kg / 80 lt
Up to 2.300 cm³ (more than 2 valves per cylinder): 680 kg / 100 lt
Up to 2.100 cm³ (more than 2 valves per cylinder): 650 kg / 100 lt
Up to 2.200 cm³ (2 valves per cylinder): 620 kg / 100 lt
Tire allocation is 8 tires for 3-hour races and 12 tires for 4-hour races.
P4 is a low cost class, for cars using Brazilian made Pirelli 13-inch slicks, with the following limitations:
Up to 2.100 cm³ (2 valves per cylinder): 630 kg / 100 lt
Up to 2.400 cm³ (2 valve per cylinder with imported sequential gearboxes): 645 kg / 100 lt
Up to 2.400 cm³ (2 valve per cylinder with imported sequential gearboxes and original intake manifold): 620 kg / 100 lt
The tire allocation is the same as P3, and from 2020 onwards the P4 class is expected to be merged in the P3 class.
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