Originally Posted by KingOfJericho
That will be an available option but there will still be the 6cyl turbo of some sort in the higher model.
Right, I was speaking of the six cylinder model.
By the way, in looking closer at the E92/E93 pricing guides, I notice that they confirm that the N54 will remain for the 335is models. I would expect the same to hold true for the Z4 35is (for MY2013 anyway). For the Z4 35i, I could see it going either way.
I am fairly convinced now that the 135is uses the N55 because it will be in production for more than just a year or so. That is just my take though.