The ITR head is also not a great choice for boost. The cams have a longer duration for the N/A app and will not be optimal for boost.
Just get a B18C1 and turbo that. Go for a MaxRev/RevHard/Precision T3/T04E kit.
You are going the WAY long way around just to use an ITR head. You can get a better head by using a GSR full swap and porting the head out.

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