The Z4 will get the S65 engine (V8).
The one in testing that has been caught with heavy camo is housing the N54 engine(TT 3.0 I6).
Z4 with N54 engine
Z4 M with S65 engine
The Z9 will have the S85 engine (V10) the N64 engine (TT 4.4 litre V8)
Z9 with N64 engine
Z9 M with S85 engine (whether this will be the 5.0 litre V10 or the rumoured 5.5 litre V10 will remain to be seen)
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