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3" expansion downpipes, 3"-2.5" testpipes, 2.5" catback, 2.5" IC piping with massive intercoolers. You'll likely want inlet piping too. At least on pump fuel. E85 is a different story. Here's mine on stock turbos with the aforementioned upgrades. That will have the fastest spool GT525s would be a little slower to spool. 
The blue run is on wastegate boost. Pretty crazy how much more efficient air flows through the engine with those upgrades that without increasing boost pressure, you're almost at the old stage III for power.
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To get 400whp you are going to need to add at minimum - 
