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the N54 uses Bosch as standard whilst as upgrade as 2 step colder and or with use of Ethanol the last i had it checked. if i have mistaken with the N55 it is may due a lot of info nevertheless the specs are for all engines the same
N20/n55
Thread diameter: 12,0 mm
Thread Length: 26,5 mm
Spark gap: 0,75 mm
Resistance: interference-free, 5 KOhm
N13
Thread diameter: 12,0 mm
Thread Length: 26,5 mm
Spark gap: 0,8 mm
Resistance: interference-free, 5 KOhm
the first 2 are the most interested. The gap can be adjusted if wished though not suggested as is mostly for are use. a friend fitted them in a N13 couple o weeks ago
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