It is the only plugs I use in my car (close to 600hp Mazda with aux fuel)
Verified purchase: Yes | Condition: New
Got these for my non tuned ST. Gap them at .30 and I have no more miss and have not had any issue with these!
Verified purchase: Yes | Condition: New
1 step colder plugs for a tuned Focus ST. They need to be gapped properly but they do a great job.
Verified purchase: Yes | Condition: New
These work great in my mazdaspeed6 after gapping them to .026
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
Good
Verified purchase: Yes | Condition: New
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