Hello, looking into changing plugs on my M340i, nearing 28k miles. I saw the differences between the normal B58 and B58TU1 plugs which many people don't realize. Majority of the time I run stock 91 tune, but once in a while bump up the boost with E40 mix for a tank or two. Would NGK 94201 plugs be a good choice or should I stick to OEM plugs? Also does anyone know the stock gap and what would be a happy medium for both performance and reliability? Heard .20-.22 can be a bit aggressive and cause a misfire or slight hiccups on a stock tune. I was thinking maybe .25? If anyone has any insight or experience with the two that would be a great help. Thanks!
Link for NGK:
https://burgertuning.com/products/ngk-94201-spark-plug
Link for OEM Updated B58TU1:
https://www.getbmwparts.com/oem-part...ug-12122455258