I know plugs are hard to find for these cars so where can I go online to order me up a set?. Here are my mods intake exhaust,tune,injen hard pipes ,stock intercooler currently running a set of gsc stage2 cams.

 

Stock plugs are fine.evo 9 uses ngk ILFR7H.try extreme psi,maperformance.better yet search on google you might find in the stores near you.

 

No need in ever using anything but stock heat range on the 9.

 

+1 Stock plugs work great in the 9s for all kinds of setups. You really shouldn't have a hard time finding them... I know the Advance Auto here stocks them.

 

Not hard to find ngk ILFR7H
Sears
Advanced
Jegs
Map
Amazon
Ebay

 

thanks guys

 

only when you increase compression do you need plugs... the oem plugs are amazing... anything else with "foul" out... basically they are so cold during combustion the carbon is able to build up on them til they just can't arc anymore...

 

NGK Laser Iridium Spark Plugs / Heat Range 7 - ILFR7H

 

Those plugs will not work on the Evo 9s