what is the difference between the grades on Iridium spark plugs
grade 6,7,8?
what will the best one for me?
2002 WRX (jdm)
full d-cat, panel filter.
remap next month.
Cheers

 

each grade is slightly colder,if remapping best with the 7,standards are a 6

 

nice one thank you

 

1995 WRX improt, exhaust, K&N......... Im getting the general opinion is NGK PFR7B is the way to go, but just wanted to make sure before I ordered????

Im not planning a re-map anytime this side of winning the lotto so are 7`s still gonna be ok or do I go for 6`s?

 

I´d go for 6´s then. BTW PFR´s are platin plugs, BKR´s are iridium.