Re: Spark plugs
The NGKs are fine. Denso will work just as well assuming you get the plug corresponding to NGK CR10EK for an '06+ (or the spark plug needed for your model year as you didn't share that info.).
At that level, it's really about politics, money, manufacturability, and quality.
Iridium is some of the best material to handle the work load, followed by platinum, followed by...
Chillin'... while the Lord watches over me!
I love my R6, but...there's no buts...
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