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I'm not a fan of iridium no matter who makes it. My favorite plug is the plain NGK. The iridium just doesn't work as well for me or I should say in my 2.7.
 

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You might have both already, if you have the V6, I know of 3 people who have Tundra's and one who has a Tacoma and it has both plugs from the factory. It seems Toyota buy's from both vendors, and the line assemblers install the plugs, and all that is required is to install the same plug in a given head, so lots of people wind up with one brand in one head and one brand in the other. Doesn't really matter, both plugs are built to the specs required by Toyota.
 

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2010 Tundra/2015 4 Runner/2007 Prius
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6 of one
1/2 dozen of another

they are both good plugs
and yes Toyota uses both like LRH said.
 
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