Spark plug NGK or OEM Mazda

I was told that the Motorcraft iridium's are made by NGK?

I opted for the NGK DIFR6D13, since these were suggested by a local Honda dealership. These seem to be perfectly fine for the CR-Z. No complaints at all.

I've been running the NGK "rs7" plugs 06K905601M in my wagon since I went IS20 with an APR stage 3 91 tune. Stock gap out of the box was .026. I've now put about 6k on them and have had zero issues.

I have NGK ruthenium’s and it is noticeably smoother at idle vs iridium’s. Literally zero idle “pop” or misfires

NGK Iridium gapped at 0.026 only. They’re great

I drive a 01 4runner and I run NGK plugs and wires. Almost 300k on the dash.

No issues with Bosch red coils from Shopdap Bosch Red R8 Ignition Coil for VW Audi 06E905115F - Deutsche Auto Parts (shopdap.com) Spark plugs: NGK Ruthenium HX, #92400.

Got some NGK Ruthenium HX plugs at NAPA this morning. Miss is gone, car runs perfectly again. Plus they're cheaper and supposedly will last longer than the platinums.

Used those for the same setup with no drama, stock gap measured at 0.026". I've run lots of different plugs....honestly, they make zero ****ing difference IMHO on my peasant IS20 and 38 1.8 sLOw OTS Uni tune...

I gapped them at 0.70mm, still the car was not what it was. And at high speed the km go up but there is no pulling like before.