[greywolf]

CR9EIX is a colder plug. NGK plugs get colder with higher numbers. Blair of SVRacingparts.com says it's fine. A plug heat range is chosen so the plug tip temperature is hot enough to keep clean but not so hot the tip erodes too fast.

 

[hornetguy]

ok, um... cool!

Seriously, thanks for the information. I was just concerned that they might not last as long as the "right" one. That's good to know. :thumbup:

 

[ozart]

I've always heard to use the coldest plugs you can get away with, that are reliable (don't foul out).

 

[bwringer]

Are you stuck in the outer reaches of Mongolia or something? Make the goober at the shop order a set of the correct plugs. Or order them yourself.

Or, for about half the money, go to virtually any auto parts store (except Autozone -- they don't carry NGK) and get the plugs. Worst case, you'll have them the next day. I've had the best luck at Advance Auto and Napa.