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Oil is an argument I'm not going to touch. I'd head over to BITOG ("Bob is the oil guy") forums if you want proper oil advice. You'll probably just get biased opinions here on oil.
As for spark plugs, I personally only run coppers in my turbo cars. They have better heat conducting properties over iridiums so will resist overheating better to avoid pre-det and such. Plus they're cheaper. I don't know what heat range is best for oe sr20, but I run a BRK7 in my KA-t. I had 6's in there but they weren't running right so I upped the heat range, and it was a pretty noticeable difference. Might need to just play with that one based on your environment.
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