Mini guide, tested by Perka and zurchpet

1.You need to flash this Fugumod kernel before flashing PerkaROM
http://fugumod.org/zImage-current.tar
I recommend SGS Kernel Flasher https://market.android.com/details?id=neldar.sgs.kernel.flasher

2.Convert to ext4 or any fs but NOT rfs

3.Then flash the latest PerkaROM

https://market.android.com/developer?pub=Renaud+Allard
Get the Paid version of Fugu app, so you can convert to faster fs than ext4

Fugu app: https://market.android.com/details?id=org.fugumod.fuguapp

here is a very good guide made by zurchpet if you don't want/can buy the app from Market
http://forum.xda-developers.com/showpost.php?p=13165650&postcount=1432