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I have an 02 wrx as I stated, I have a tactrix cable that I can run diagnostics on my pc and even with 93 I receive knock on occasion. But with wear and tear it's expected, I do need a service and tune to fix my a/f but 60% of it is poor octane. I've put 87 in when I had to and burned through it fast, stayed out of boost and would have more backfire during dfco mode.
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