Car has been running real rich lately, so I just took out my sparkplugs at 9k, and put in stocks from friends evo, and it ran MUCH better. Now i cant keep his but i was wondering since i have to buy new Plugs should I go with stocks or would some diff ones work better?Perhaps go colder or switch brands?
Mods on car are:
Turboback exhaust
Intake
Boost Controller
BoV
AF,EGT,Boost gauges...

Any help would be great, thanks!

 

Go with stock. You don't need to go one range colder until you have more power...