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Well I had a huge novel wrote out and it got erased so since I'm not retyping it here's the shortend version.
Rb25 cons:
Pistons&rings only good for 350-400hp reliably
Ecu is pure junk.
Short oil drive snout.
Fix those 3 problems and you can see 600hp reliably.
I would get 3"+ exhaust if you want 500hp and a larger fuel pump.
Now people have pushed a stock rb25 with larger turbo and supporting mods past 500hp. Yes it can be done but let me ask you this, how long is a piece of string? Sooner or later at those power levels something will give. You're only as strong as your weakest link.
I'm swapping in the rb26 rotating assembly to fix my short oil snout and ringlands and plan for a reliable 500hp.
Aem standalone to tune it.
I could probably push 700hp no problems but at this point I don't think I need that power quite yet.
If you have anymore questions just ask.
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