We have 2 members that are doing testing on multiple plugs but haven't gotten any results yet.
Personally NGK Iridium is what I would/will be installing in my girl.

Sent from Titan Land

 

I think thats what comes in the trucks

 

anybody using these?? E3 Spark Plugs

 

I just replaced mine with what came originally, NGK Iridium.

I've never read through this thread so I don't know how useful it is for you.
http://www.titantalk.com/forums/sparkplugs-com/68677-spark-plug-dyno-test-results.html

 

I'm running NGK double platium. Which in what my 05 Flex Fuel calls for

 

Just put NGK laser iridium plugs in mine. Part number 4469 at most parts stores

 

When it's time, I'm going back to NGK. Why fix what's not broken?