Where is it?
Around the bulges beside the driver and the engine cover behind them.
What does it do?
Those side bulges are called sidepods. They admit air to the cooling systems and let heat escape. The outer surfaces also guide air towards the rear.
What to watch in an update
Look at the air inlets and cooling outlets. Larger openings at a hot GP may help keep machinery at the right temperature, rather than simply improve speed.
This guide explains the basic role. The FIA submission gives the stated aim of each individual update.
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