So bone stock rb25 has walboro 225,freddy manifold ,boost controller,fuel controller ,turbo back exhaust , fmic, ls1 coils.

so the plan is to go top mount holset hx35 with tomei 256 poncams on stock injectors for a week or 2. i am just wondering how much boost i can run until i get bigger injectors and ecu all in. also should i pick up a fuel pressure regulator. I have a wideband.

Getting that screw to fit under the hood reminds me of a live show you can check out in Tijuana. Are you sure you want to do that?



Granted, that's a 52, but the 35 is still hugemongous. If I am reading that map correctly, that thing will flow a crapton of air. I wouldn't run any boost until I had a fuel system that could feed adequate go juice to support that thing, 0.3 at the most, but are you sure you can spin it? Grab the smallest exhaust housing they have for a 2.5. Absolutely you should get an adjustable regulator.