I've deleted the RAID as well, il try to install with just the speed step

Regarding audio and wifi, i know that the latest iPC has support for them. It doesn't work to install from that DVD but mabey there's a way to extract the "drivers" for it.. ?

EDIT
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I've finnaly managed to install with a modified 132 boot loader and a retail DVD

Next step:
Finding out how and what kext to add :S