I use [Denso IKH24's](https://www.fcpeuro.com/products/audi-vw-spark-plug-denso-ikh24). It's the projected tip version of the Denso plug EQT has recommended on their FAQ (IKH01-24).
I always run champion platinum in the coil rail 4.0s. Sometimes engines are particular.
Use only Honda specified plugs (usually Denso Iridium) and they last 100,000 miles just fine.
I like ac delco. But I recently used denso tt fine wire plugs I two different ls engines. What a difference in power. And gas mileage.
You can get the champion version of the RS7 plugs for less than $20 a plug and they’re working great on my car!
I just replaced mine, at 80k, with Denso PLatinums. The same brand as the stock plugs.
These were actually alright spark plugs. The ceramic is a lot tougher than normal ceramic, and the electrode is larger. They were marketed as 'truck plugs', but they're really good in old tractors and farm equipment. They last forever.
Back in March two days after finishing the Water Pump replacement it started misfiring. I started with replacing the spark plugs with OEM Denso's, but that didn't fix it but was VERY NECESSARY.
Porcelain tip fell off one Denso spark plug in cylinder 1. Doing less the 200km distance. Motor is f@$ked.
I had EPC light/limp mode and P303 as well about a month ago on my '12 GLI (APR Stage 1+) at 102K miles that recently had a walnut blast and new Denso plugs at around 101K miles. Swapped coil packs as well and still P303 with EPC light/limp mode.
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