Spark plug Denso or BERU
I bought the absolute cheapest plugs available ($1.50/plug), and they are branded "Denso Toyota Iridium" - I assume fakes, but my magnifying glass does seem to show an iridium tip, and they work great.
I did Denso 3297 from RockAuto. They work great.
I've always used the Denso SK20R11 plugs in mine and been pleased.
Denso iridium plugs, no more no less and no exceptions.
denso iridium. do them and they’ll be good for another 200k km or more
Denso and Bosch have worked well for us on a 1.6.
Denso itv20 (5339) for stock/mostly stock. ITV22 (5340) step colder if more mods. I have only used itv22 since 2015.
I ran Beru RS7 plus which are one step colder when I tuned stage 1 and they didn't last at all. Might have been under 10,000 miles. Recently went with NGK plus that APR reccomends for stage 2 and so far so good. No misfires since.
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.
Skip them, they are junk and a waste of money.
Get a good single platinum plug like the Denso 4511.
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