I know this is a stupid question but i was curious if u can use ngk plugs #9 all the way around.I had them in my FD and there was no problem and i was just curious if u can use them in a FC?

thanks

 

Modded TII, sure. NA, don't bother.

 

the 9's are all i ever used...even before
mods..the dealers in europe wont even sell me the 7's anymore

 

Actually NA's are pretty hard on plugs because the mixture burns at a higher temp because theres no excess fuel to cool it down like a turbo. 9's all the way around in an NA work fine if you drive your car semi hard I used to run them all the time and never fouled one. It makes your leading plugs last bout 2x longer, or atleast it did for me.

 

I know J-rat uses 9's all around with good results. His car hits hard but takes some time to warm up. Ask him if you want to know more.

 

I use them in my NA all around, so far so good. The 7's wear really quick and having an MSD seems to accelerate that problem.

 

Thank you guys..