I have only used Bosch plugs in my cars, and I have not had any issues with them yet.
Bosch iridiums, these for longevity, copper ones have better spark if your concern is performance
Today I installed new spark plugs and the misfiring situation has improved significantly but is not completely gone. If I pull up the RPM too quickly the misfire counter goes up.
Densos. Buy them off rock auto.
The Denso IHKs are my go to for the last 10k on their tune.
Either one, but I found the Denso to be cheaper and easier to get. No issues with them.
You can usually find DENSO IRIDIUM Spark Plugs , which are the OEM Supplier, for about $15 each at any Advance Auto or other major auto parts store.
Currently just swapped to Denso's IK20 like 2 months ago. They run pretty good. But now its mid summer over here and the car runs a little bit underpowered at those high temps.
I have the 24's, not impressed.
I did not have good experiences with Bosch on another vehicle.
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