I am thinking of switching to V-power NGK, because they are cheap and I don't mind the service interval. Any down side to copper plugs other than the decreased service life?

 

I use em. No problems thus far.

 

Heavier wallet.

 

I use copper on my turbo S and evo. They are nice for tuning too since they're like $2 and cheap to replace after lol

 

They are non-resistor type plugs, HUGE pain in my ass until I figured out what was wrong. These plugs cause a ton of electrical interference on all the other electronics in the car.

I ran into problems like my speedometer would randomly cut in and out when I had 4.77s and it was running through a yellow jacket and my laptop constantly going offline when I was connecting to Kmanager or AEM via USB. Someone mentioned my plugs, and when I swapped them to the BKR8EIX Iridiums, I never encountered these issues every again.

And you know its always possible that that interference was causing other issues throughout the car that I just never noticed. if it were to mess with my external wideband or OEM narrowband and throwing them off without me knowing, that could have been detrimental to my build. You never know, cheaping out on these plugs is a rookie mistake I would try to avoid.

 

Most high power Evos run standard $2 copper plugs. They just change them often. I hear from Evo guys that they actually work better than expensive iridium plugs. And that the only benifit to iridium plugs are that they last way longer.

Is there any truth to this?

 

Yes. The problem is finding a copper resister plug in the right cooler 8 heat range. The 2668 Iridiums mentioned above are the naterial best choice as a result. The bennifit is they do last a hell of a lot longer, about 10x.

 

How long do the iridiums usually last on a boosted setup?

 

BKR8E should do it.

 

I put about 80k on a set before I decided it was time to change them.