[flipmde786]

I'm concerned about the added weight from the engine block itself, in addition to weight gains from getting bigger. Not nice.

It would be great if they could maintain the current weight, but its not possible with the N54 unless they like rip panels out of the interior or something lol.

But yeah, it'll still be faster than 335i and marginally faster than 135i (assuming a lower weight). But a Z4 shouldn't be just marginally faster IMO.