Maybe some one can shed some light on this:
In my mind, I feel that going with a TT 6 cylinder doesn't make sense at least long term. If BMW decided to use a "detuned" version of the TT 8 cylinder used the M5, X5, and X6 variants, this would allow them to easily make the power they want with plenty of room for them to grow. Additionally, I would think they would gain more reliability as they aren't pushing to the extreme a 6 cylinder and then having little room to grow. A TT 8 cylinder would allow them to meet their number for the next generation or even 2 generations.
The downsides of the 8 cylinder are perhaps weights and definitely mileage.
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