After some research, settled on NGK 4469 plugs.

Went through fatwallet.com and got them $7.99. Normally $8.49, but there is some NGK discount.

To top it off, 4% cash back from fatwallet.

 

Well crap after reading every dam post....these are not the plugs I am looking for.

 

Yeah, I'm assuming you read this then:

https://g35driver.com/forums/v36-eng...007-sedan.html

The plugs for these cars are pretty particular; they have a less common 12mm thread spec. to go along with their rather extended reach, and an outer hex size of just 14mm. !! That means most people won't have a proper spark plug socket for these plugs unless the made one themselves. A quick tell is that you can't even fit a regular (larger ) spark plug socket down into the hole to get to the plugs.

DENSO info:
http://www.globaldenso.com/en/produc...2006/12_1.html
NGK info:
http://www.ngksparkplugs.com/techinf...tnumberkey.pdf


If you were dead set on using an NGK brand plug, the correct one should be #1406 ( DILKAR7B-11 )


I really don't see the point though, since they are almost twice the price of the Denso #3442. I'm sure you can shop either one down a bit, but I'm pretty sure the Denso will still be cheapest.

.02

 

Well getting plugs in Tucson is PIA.
Finally found some Autolite Double PLatinum APP5683, but the quality sucks. Misaligned electrodes, no protective tubing so gaps are all over the place. The one in the pic is .024" while the OEM is at .042"

I am putting the old one back in till I can get some Densos on order.



This is the original. It looks good for 80K miles. I am the second owner at 77K miles, I can't imagine the original owner paid to get new plugs since its not recommended.
Are OEM Nissan/Infiniti branded? Mine aren't.

 

^^ I haven't replaced mine, as I'm only at about 62K miles, so while I can't say for sure whether the originals are branded or not, but judging by your first pic, it sure looks like I can just make out the "O" from the what I assume is the Denso branding, and I can see the end of the plug code - - - - - "HR11" (presumably from FXE22HR11). Also, judging by the looks of your stock plugs, as long as the gaps aren't way out, I'd slap them back in, as they look great. Just use them up, and save your $$ for something you probably need worse than them.

BTW, good call on the dumping the AutoLite plugs. Call me a snob, but I wouldn't run those things in anything but an old farm truck or a lawnmower.

 

VQSmile youre assumptions are right. They are Densos.

I have plugs on order, $12 each plus free shipping from Amazon.

I will save them for my 90K mile maintenance.

 

You can get the iridium or Plantinum NGKs from Audvance auto and use a 25% off code something like that. Came out to 45 bucks.

 

Dammit!

I was so frustrated, I just bought them without checking AA.