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Here's my opinion. If you want 155's, go with Innovative, and they build them from newly remanufactured injectors straight from Ford.
As for the heads, if you swap to a good ELC, and a coolant filter, you may be fine. Also you need to monitor your EOT, ECT, and fuel pressure. 6L_strokin ran 180's and an RCD turbo with an EGR delete and stock head bolts and he never blew his gaskets. He sold the truck with 218k. But you may not be as lucky, so be prepared to add studs at any time.
As far as fuel, I'd go with an AirDog 2, along with 6.4 banjos and the updated Ford FPR. If you're stuck on a regulated return, I'd pair it with an AirDo 150.
And with a straight pipe the PowerMax will be louder than the '03. But the change of tones that you hear through the exhaust is actually just the turbo vanes cycling at idle. That is in your strategy, not your turbo.
2013 F-150 CCSB Oxford White FX4 EcoBoost
Loaded with every option...
2008 F-250 CCSB Dark Copper King Ranch 6.4L FX4
4" MBRP Exhaust w/ Muffler (DPF/DOC Delete), Modded Stock Intake, H&S XRT Pro