Which of these NGK Iridium one-step colder plugs should I buy?
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06-01-2010, 01:54 PM
2002 wrx w/ STi guts
174k miles on Mobil 1
#2667 is the correct one colder Iridium.
The 2667 is a BKR7EIX, the 6988 is a BKR7EIX-11.
The 2667 comes with a gap of .030, the 6988 comes with a gap of .044 (1.1mm)
Don't try to gap them!!!! lol
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