Spark plug Champion or Denso

Denso Iridium 1 step colder plugs. Running great on my 2017 Jetta 1.4T

For spark, I wasn't sure I had the right plugs so I went with the OEM Champion plugs that were recommended in the Bentley. I checked for spark, no issues there.

Get the oem denso ones. There is nothing better than oem for that kind of thing.

This is what a 202k mile spark plug looks like on an 2013 Lexus gs350 daily driver. Pretty impressed with it overall. All 6 plugs look exactly like this.

For spark plugs, denso or bust

I've been running Denso (5346) IKH24 Iridium gapped .024 on APR stg1 for 48k miles and most recently on stg 2 with no issues.

Denso TT iridium are so far the best ones I’ve tried in terms of performance

No discernible difference to me, positive or negative. But since I am running APR stage 1, I followed APR's recommendation.

Champion plugs are barely adequate for a lawnmower...

Skip them, they are junk and a waste of money.

Get a good single platinum plug like the Denso 4511.