i just got stock ngk plugs they come pre-gaped at 21, should i gap them a little more like "24-26"???

 

Judging from your signature, you have an evo 9, meaning you bought stock ngk iridiums which come properly pre-gapped... You shouldn't try anything with it or you'll probably destroy it.

 

bump!

 

i'm putting in the plugs today cause i'm getting a retune tomorrow, should i re-gap or leave them at 20-21???

 

Did you not read that guys reply? If you have a evo 9 then you should have iridiums. You don't gap iridiums unless you feel like buying more.

 

I guess they are gapped to that for a reason, but I think that is a crazy tight gap.
You are not going to see any effect likely from either setting. Maybe tighter you might burn up plugs quicker, but doubtful.

for ref I keep mine at 24. They were a little wider open at like 36 (which i think was spec/ but still seems wide IMO) and i was blowing out spark and sputtering a little.

 

you dont gap iridiums plugs why not?? lol

 

The iridium tip is fragile and you risk breaking it off if you try to gap them.

 

You have an 8, he has a 9.

Think before you post. So much misinformation getting posted because of minor ignorance.

 

i left them the way they are at 20-21 gap! the plugs i had in that i replaced i gaped them at 24-25, but the car drives the same with the 20-21 gap?

 

Spec is 28 to 31for an 8. Stock NGK Iridiums out of the box are gapped a tight 28.

 

Cmon dude. Seriously? lol
Actually there is a post on here about plugs on a 9 and I believe they said spec was 24-25 too. Im sure there cant be that much of a difference in spark due to the all mighty MIVEC.

You need to relax a little bit. My point is they were gapped like that prob for a reason, but will very likely not make the slightest bit of difference.
But what do I know. I run $1.25 plugs in my car that I gap myself.