I'm giving my GSR motor a spring tune-up and was thinking of upgrading the spark plugs. My setup is 94 GSR motor with CTR cams, ITR pistons, skunk 2 intake and a rechipped p28 ecu (9000 redline).
Right now I'm running NGK R ZFR6F 11 plugs. Is there anything new and improved out there? Or is that about standard for this setup?
Thanks

 

you can try iridium plugs, ngk make them too. supposely you'll get a better combustion( don't quote me on that).

 

I would use NGK PFR6G-11