Spark Plugs Fouled by a Rich Tune: A No-BS, Numbered Deep Dive for Tuners Who've Been Burned

https://www.scribd.com/document/976015930/JDM-Parts-Pricing-in-2025-A-Straight-Talking-Number-First-Deep-Dive-133282

1) Why this list matters: stop changing plugs and hoping the next set will hold up How many times have you thrown a fresh set of plugs at a problem and watched them blacken again after a few heat cycles? If you drive a turbo Subaru WRX, an