Just droped in some ngk ZFR6F-11 into my jdm d15b, the shop that did the swap had 5f's in there...
Im seeing that 6j's are what honda calls for but am now having trouble finding 6j's. How big of a diffrence are the 6f's and 6j's?

Side note- the 6f's i put in feel great, noticable diffrence, but still worries me
what should i do?

 

i ran whatever was called for in the d16z6 thats what i would use