New aftermarket NGK Iridium spark plugs for NA and NB Mazda Miata. Set of 4 spark plugs. Part numbers BKR5E-11 or BKR6E-11 (one step colder). A colder spark plug is usually used on an engine with performance upgrades. Fits 1990-2005. Choose between BKR5E-11 or BKR6E-11.
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