1 - hdiutil attach "path-to-your-ISO" -readwrite

This command will mount your ISO.

2 - Create a folder named Extensions on your Desktop

mkdir /Users/"YOU"/Desktop/Extensions

3 - mkextunpack -v -d /Users/"YOU"/Desktop/Extensions /Volumes/"Mounted-ISO"/System/Library/Extensions.mkext

4 - Remove the MeDevil's kext(AppleNforceATA.kext)

5 - Replace with the one known to work for your chipset

6 - Fix the permissions on your new file

chown -R root:wheel /Users/"YOU"/Desktop/Extensions/"YOUR KEXT"
chmod -R 755 /Users/"YOU"/Desktop/Extensions/"YOUR KEXT"

7 - kextcache -a i386 -K /Volumes/"MOUNTED-ISO"/mach_kernel -m /Users/""MOUNTED-ISO"/Desktop/Extensions.mkext /Users/"YOU"/Desktop/Extensions

8 - Place the newly created Extensions.mkext into the ISO and burn it to DVD and try again.

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Mac OS X 10.6.3 • 2.8 GHz Intel Core I7 860 • ASUS P7P55D • 2 GB 2 Ghz DDR3 • ATI RADEON XFX 4890 1GB • 2 x Hitachi 160 GB Serial-ATA • PIONEER DVD-RW DVR-112 • LaCie Desktop Harddrive 750 GB USB