The engine bay in the Z3 is big to start and designed with the straight six in mind. The V12 isn't that wide and a similar length. It is doable as BMW have proved but you would be better off and have an easier life going with the M3 straight six conversion. If you really must do it you can pick up and old 7 series very cheaply these days and between both cars you should have enough parts to make it happen. Go for it !!
Last edited by Lucky@LeMans; 24th December 2018 at 15:28..
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