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BC valve springs will work with any camshaft. BC valve springs are A LOT stiffer than stock, so they will handle high rpm abuse and help ensure the safety of your head/engine.
What are your concerns regarding tuning that you wanna meet someone for?
Since your in Japan, not too many people know about the 2871 turbo, they all use gtrs, which is the closest one to it...
Stock fuel rail is fine.
Do you drift and if so, where at?
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