The only reason you would have to do injectors or anything with the injection pump whether it be twins or larger is if you went with a compound setup. You can run the factory turbo on a nice 90hp tune and be perfectly happy I know many members on this forum that do just that. I would recommend doing headstuds if you are ever going to use a 120hp tune.
The steed speed performance T4i exhaust manifold does flow alot better but you do have to delete egr with it. But keep in mind you can run the factory exhaust manifold just fine on a stock turbo.
Me personally I would run a small 90gph lift pump just for a much more efficient fuel system it will help in towing and fuel economy.
If you have anymore questions please feel free to ask
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