I put together a chart, based on input from other members and some S2ki searching. If you see anything wrong please let me know. Also the "Gapped" column reflects the gap the plugs come with. If you use a different gap with a given plug, let me know. Other plugs can be added too.
-Thanks

 

what is equivalent to stock but one step colder??

 

IFR8H-11

 

Which kind should a turbo s2 with around 400-450 horsepower use. Looking for some input, as I'm a scrub.

 

OK the search function is working now. Looks like for FI the most common plug gap being used is .035", and some are using .030". Maybe .035" for up to 10psi boost or 330WHP, then .030" for >10psi or >330WHP?

 

R5672A-8 at .032" gap every 2500 miles. I was getting the R5672B-8 but ngk doesn't seem to be producing them anymore.