Secret Subaru spark plug for more power WRX?STI ej257/ej255

Better spark plugs than ngk LFR7AIX imho
reasons:
smaller gap (prevent spark blowout at higher boost or higher volume turbos/cams), longer life. the single iridium gets roughly half the service life of the double iridium or oem plug.
Part number for the new plugs featured in this video:
NGK ilfr7h or 5245
(Buy from reputable source, avoid rock auto/ebay/amazon to avoid fake parts (especially if price is lower) Autozone/napa or similar dealer recommended )
long reach ej255 or ej257
double iridium heat range 7

subaru suggested interval 60k (aggressive driving or modified)

ngk suggested 80-100k (most people do this for normal driving)

fitment: subaru
2004-2020 sti
2006-2014 wrx
2005-2009 legacy/outback turbo
2004-2013 forester turbo

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