The flange bolt pattern won't match up. The only head the GSR manifold will fit on is the GSR head. Not to mention that you would have to switch out the ECU to run the IABs, but then the fuel and ignition curves will be off.

I recommend you sell the manifold and get either a Type-R manifold or Skunk2 manifold, both which will bolt right up without having to deal with IABs and will give you more power than the GSR manifold.