There are absolutely no tweaks of any kind, this is full stock.
You can download it here: https://faramir.eriador.org/r/full-m...a-en.4.0.4.zip
It can be installed with CWM.
You should not need to wipe (except maybe cache). That said if you have weird issues, like accounts not syncing, try wiping.
I installed it over CM9 without wiping, but your mileage may vary.
If you come from pre 4.0.3 ROMs, please wipe.
gapps are not installed, so you will have to flash them too. You can use my mirror at https://faramir.eriador.org/r/gapps-...317-signed.zip
Please prefer the version of google apps you were already using, otherwise you will more than probably need a wipe.
Note that this is stock, hence there is no superuser, you will have to install superuser and su by hand like on a stock rom.
Here is a mirror for it: https://faramir.eriador.org/r/su_ICS_GN.zip
It should be compatible with all 4.0.3 custom kernels although I only tested FuguMod (http://forum.xda-developers.com/show....php?t=1438417)
This is full stock, which means if you keep the original kernel, it will reflash stock recovery at first boot.