1. Oil cooler most definitely. 25-row Setrab minimum with thermostatic sandwich plate. No idea where you would get this in Germany.
2. Not necessary unless you decide to be hardcore. Replace the diff fluid with a quality synthetic like Redline. Change it regularly after a couple of track days.
3. Brake fluid should be switch to a high temp fluid, 260C+. Pads should be replaced with track pads, it is not necessary to touch the rotors initially.
4. Drop the tire pressures a little before you start hot lapping as the pressures will rise. This mostly depends on how hard you drive.
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