first go download kext utility if u already havent got it.

say ur target snow leopard volume is called "SNOWLEO"...

copy the two voodoo kexts in the zip to "/snowleo/system/library/extensions"

open up the folder that has "kext utility.app". dont run it... just leave the window open.

open up another finder window and browse to "/snowleo/system/library"

click and drag & drop the folder "extensions" onto the "kext utility.app" in the other finder window u have open.

it will ask u to authenticate by entering ur password, do that...

kext utility will repair the extension permissions and build and pack a new "extensions.mkext"... it might not successfully create the mkext, just ignore that...

reboot into snowleo...

that should do it... btw, what ps2 hardware are u tryin to get working?