TGV Deletes would be worth 10+hp at your power level. You should have done them when you had the manifold off for the APS turbo inlet! If you decide to do those I'll give you a free set of 8mm phenolic spacers to throw on there too (I have made and sold 100+ sets of these in 3mm & 8mm thick). I also have STI TGV housings that I could sell you to speed the swap up.
Do not go for the APS header. The uppipe is too small (1.75"OD) for your power level.
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