Just wondering what spark plugs you guys in the 600 hp range are using. I was looking at the NGK bkr8eix or bkr9eix. I will also be running on E85. So I know that help if I ran the hotter plug bkr8eix which are currently in turboed RSX Type-S and would be nice to keep all the plugs the same.

 

BKR8EIX is what I use..

 

I'm using Denso IK24's currently. I was using the NGK's, but I like the Denso's much better.

 

Used BKR7E at 900+whp without problems. You will probably have more problems fouling out the 8's and 9's than blowing out spark on the 7's.