Welcome Ralf!
Add the front M3 suspension bits to your list, as well as the HP Autowerks rear toe arms and rear sway bar. Camber is key. Like the others say -3 up front is good. Get a set of Apex Arc 8s. Light, wide and cheap, yet still a great dual purpose wheel. Next will be cooling the brakes and the oil down. That's a hole separate thread haha.
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