Well, I bought some Denso Iridium IT20 Spark plugs about a year ago, and they're STILL sitting on my desk right in front of me. I plan on installing them soon, but I had a question as well.
What is the advantage in having them? Ive heard that it improves idle quality, etc, but what are some other reasons??

THANKS FELLAS!!

 

TTT

cmon guys!

 

Fewer misses at higher RPM's as well. Somebody on here has done a complete plug comparison with graphs. Denso's were the best bar none in the test.

 

They are great, I switched form NGK TR-6's and will never go back, but I'll let the experts answer you on why they're better
http://www.denso.co.jp/PLUG/iridium-e/index.html

http://www.densoiridium.com/index.php?flash=1

 

Nothing like some real tuner tales to top it off, LMAO

It looks like the Fast and the Furious crew have been using them with their usual incredible results. This is probably before the NAWS.

http://www.densoiridium.com/tunerstales.php