i know i have asked the question before but i didnt really get too many answers.

I was looking at the 6564 ngk plugs which are now superseded with 7173.

is there anybody using them with Forced induction and what are the impressions?

thanks

 

For what its worth! I use them w/ my 75 hp shot dry NOS kit and they have help up really well.

 

and they are defenitely a range colder and fit threadwise?

thanks