For this week, check out the CyanogenMod9 ICS ROM, which has been updated to Android 4.0.4 for both Nexus S and Nexus S 4G. CM9 is certainly one of the best ROMs you can run on your Nexus S and Nexus S 4G and right now is probably one of the best times to flash this as everything works flawless. Get your overclock on to 1.46Ghz too with Matr1x kernel or your favorite Nexus S kernel!
Download Matr1x Kernel (get 18.5 CFS, works on both Nexus S and S 4G)Need Help? Follow/add me on Google+, Facebook, or Twitter!
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You will need a rooted Nexus S to install all ROM/kernels.
NOTE: PLEASE ONLY INSTALL ROMS INTENDED FOR YOUR VERSION OF Nexus S! Otherwise you WILL BRICK YOUR PHONE and I will not be responsible!
How to Root Nexus S!
First time to rooting and custom ROMs? Please see our Nexus S FAQ FIRST! Nexus S ROMs
Nexus S ROMs
Nexus S 4G ROMs