I was wondering which company make Iridium Spark Plugs for 350Z?

How much are they?

Where can I order them?

If you have these plugs in your car, what is your opinion on them.

 

Denso
HKS
Greddy
A'PEX

 

we sel the Denso (who is the actual maker for all the plugs listed above)

 

NGK also makes an iridium plug for the Z

 

Installed Denso Iridium Plugs IKH16 about three weeks ago. Order them from http://clubplug.net @ a cost of $11.20 plus S/H. While it is hard to form an opinion in three weeks, at this point in time I am very happy! Don't know how much research you have done on the plug, so might suggest you go to:
www.denso.co.jp/en/

 

what's so good about iridium plugs?

went to above web site-page not there.

thanx

 

Just visited both sites by clicking on those listed on my post, ClubPlug and Denso. At Denso, click on "Products", then "Aftermarket" and scroll down to "Iridium" plugs. ClubPlug should have a "Tab" for Denso. It will only show type and cost.

 

How much are they?

 

which is better, denso or ngk

 

I recall the NGK iridum center electrode is not *quite* as small as
the Denso, but still smaller than a platinum tip. I'm also not sure if the NGK has the U-groove on the ground strap like the Denso. But then again NGK has a more "OEM" feel to it and a long standing reputation. To me Denso seemed like the most superior plug for performance "on paper", but I wanted to do research to see if the reliability/quality was there. I decided it was and I went with Denso, otherwise I would have picked NGK.