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Since you already have the turbos all you're really looking at is some custom piping, an intercooler + bov, and a couple of wastegates (assuming the turbos you have aren't internally gated). I believe the stock ecu will compensate for up to 8psi so no tuning really needed (though not ideal). T3/T4's really aren't that large and could probably fit where the cats are on the stock headers. If you wanted to be really cheap you could probably have everything done for about $2-3k...
 

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I read that thread which is why I made the comment. What I should have said is - the stock system has enough fuel to compensate as there are two complete sets of injectors and the system is 98% direct injected at wot. Whether or not the system can read positive manifold pressure is a different story.
 
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