JonMBZ

Hello,

I am getting close to needing spark plugs and I looked and the OEM ones are over 200 for the set. I was thinking there would probably better performance ones in that price range. Does anyone have any recommendations?


Thanks!

gt4awd

I bought my NGK Iridium IX 2 Stage from https://www.sparkplugs.com/

First I contacted NGK directly to find the best plug for my planned modifications. NGK recommend a set not even listed. Smaller gap, and higher heat range. They cost around $10 dollars each. A set for your engine should be even cheaper. Just go with the basic Iridium IX.

Phil C55

I don't about that, he has to buy 16 plugs.

gt4awd

The regular NGK Iridium IX only cost around $7 dollars each.

spr

Note that it's also a NA motor so different heat ranges and possibly gap-

alumar

you know what is funny... the plugs i have to use for my car is the coldest copper plugs i can get gapped to .07mm per Cory @ Kleemann

I just recently changed them with all of the engine fiasco ... they cost 0.88 cents each x16 ...roughly 15 bucks for the set

Cheapest cold copper plugs and rocking out low 12's at 117-118mph lol

ITAVMT

For the NA engines, I would suggest the NGK 3764. This is an iridium plug and is one step colder then stock.

For a FI motor, you can't beat copper for cost. A lot of old school guys swear by copper plugs. If you aren't making 700+HP I doubt you'll notice any loss or gain from using copper/iridium/platinum plugs.

FrankW

just get the NGK iridium IX that's recommended. you will not likely feel any difference.

i took out my denso IK20 replaced it with iridium IX when i was diagnosing my car's idle issue few months back. made zero difference.

Phil C55

+1 Not only that, but the OEM plugs are included in the emissions warranty which is 8 years and 80,000 miles, so if they really are bad (which I doubt) they are under warranty. Unless of course you have a high mileage C55.

JonMBZ

thanks for all the info guys, they are not bad I am just going to do this for maintenance purposes and yes I am way out of warranty just put 90k miles on it. It sucks I put the miles on this car so quickly ;(

c32used

Look for Denso IK20s on Ebay you can buy them by sets

spr

Why would you go 1 step colder if it's NA? You're increasing the chance of fouling for no/negligible reasons.

spr

Anyone use those E-3's? I've heard mixed things with fouling despite power gains...

Phil C55

Only in a way, you also got to enjoy the car and it didn't sit as a garage queen. You're getting your monies worth by experiencing the car, worse things could happen.