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So, not to hijack this thread, but it's sort of related... I recently read in GRM a recommendation from a well established Subaru tuning house that they suggest walnut media blasting to remove carbon buildup from the FA20 intake valves in WRXs every 30K miles (!). Since common symptoms of carbon buildup are lower power, poor idle quality, etc, I wonder how much truth there is to this, and how applicable this would be for us...?
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"To know a thing well, know it's limits. Only when pushed beyond its tolerances will true nature be seen." Amtal Rule
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