Anything more than 22-23 PSI those turbos run out of puff.
I'm currently running 340KW on E85 and honestly i can't see you getting much/if any more than that, anyone that says they are running more that 350kw at the wheels either have a larger motor (2.8L or something), the dyno is out, or they are flat out lying IMO.
In saying that:
1. Equal length is all about sound, Fk all in gains if any. Yet to convince me anyway.
2. Id pull the stock airbox off and put something else. Personally i run an ARC box because bling and power.
3. i didnt port mine.
4. Apexi Power FC L-Jet, switching to Nismo AFM's. - should be fine. I f**ked off my PFC and AFMs because i got sick of the AFMs, and wanted a flex tune with the Haltech.
6. Interwarmer will be fine. If i was doing long hard tracks i would replace it with an ARC item. But for the street driven/occasional track its fine.
7. Any more than 22PSI and you will literally get nothing from them. I found a sweet spot around there. Pushing them harder is a stupid thing to do and you are asking for trouble, whilst getting no gains. They will NOT run 25psi.