2fs2ns wrote:Ok, here's what I've found, what do you guys think?
The text on the plug reads NGK IR on one side, and DILFR5A 11 on the other.

Ok. NGK IR=NGK brand, IR=Iridium plugs. Spark plugs come in copper (basic), platnium (middle), and Iridium (newest).
the DILFR5A is the NGK part number.