The spark plugs i have fitted on my 155 Q4 were Bosch WR6DTC (3 lateral electrodes), the recommended ones!

But i wan't to change them. I've discovered that they are discontinued. They were changed by Bosch to WR6DC+ (just one central top electrode).

Anyone of you is using this last ones?

Or are you using another ones? Wich ones?

My Q4 is using a KN filter (box replacement) and a Squadra chip besides a direct 3' exaust ...

What spark plugs do you recomend???