Gonna change my plugs soon and wanna know what the best plug to put in our cars are?
I see the say NGK laser iridium and I know one heat range colder is good but is there something better for it?

 

I use the Evo X's plugs which are one step colder and work fine. Not sure what everyone else uses but NGK works pretty good from my experience.

 

I also use the Evo X plugs. They work fine.

 

If you are stock boost - stay to the heat range specified. Once boost is increased - use the EVO X heat range.

 

Stock OEM NGK plugs is what should be used. I tried 2 other plugs just to see if there was a difference and had a bunch of firing issues and it changed my fuel trims when logs were taken. Put OEM plugs back in and works flawless.

 

Yes Im running a bit higher boost so OEM Evo plugs it is!
Thanx guys and gals!

 

perscisely what heat range is the oem RA plug and the evo x plug?

 

The heat range is 7 for the ralliart and 8 for the evo x.

(NGK ILKR8E6) - evo part no.
(NGK ILKR7E6) - ralliart part no.