Spark plug replacement question - 2004 Prerunner 2.7L

I recently replaced the spark plugs in my 2004 Prerunner, at 120k per scheduled maintenance guide. First time doing it, I just went with the first option that fit my model which ended up being Bosch iridium (pre-gapped, which I measured at 40). I have this sneaking suspicion that I might have lost a little bit of power, but I may also be paranoid. Am I? (original plugs were NGK)

Further research showed that a lot of guys like NGK for Asian cars and Bosch for European cars, but idk what the difference is... Thoughts?

 

I would stick with DENSO or NGK

 

Iridium, or double iridium? Also, change your wires while your in there.

Edit, 2.7, no wires, my bad.

 

I think the proper plug is DENSO

$53 SK20HR11 ---- IRIDIUM PLATINUM power pack Spark Plugs -- # 3421 ----- 6 PCS NEW

SK20HR11 Iridium this is what my 2.7l specs

 

My manual doesn't say anything about spark plugs really, and the ones I picked up came back as compatible when I looked them up. Weird.

 

https://www.sparkplugs.com/Automotive-l134.aspx

 

I run NGKs in my 3RZ, every 15k miles I swap them out. Sounds frequent, but I'm OCD about maintenance, plus it's cheap and takes 10 minutes to do after an oil change.

You won't feel a loss in power over spark plugs. A test across the board of all available plugs/brands/types would likely show a 0-3hp difference, which you'd never feel from the seat. If anything, maybe you didnt fully seat a plug wire, causing a weak spark on a cylinder, but that may bring a CEL.

 

I went with Denso last change.

I'm not sure what wires you would change as the coils (4) sit on each plug on an '04 3RZ.

 

Fixed