The interesting thing is, this car was apparently never build by tuner Manhart...
So quite the error from Top gear who didn't do their homework
https://www.zroadster.com/forum/thre...2#post-2460206
This car is the "Hornisse" which at some point was apparently labeled with manhart stickers/bodyart, supposedly when it was with a later owner in switzerland.....
Why and who did that is not clear but its strange to say the least, that a tuner (quite a famous one....) claims a build from another person.....
There are quite a few reports on the german z forum that it suffers from reliability issues.
There's also a guy in the UK that did a s85 swap.
The electrical part of the swap is supposedly the most difficult. Integrating the s85 ecu in the rest of the z4 (which is 1 or 2 generations older)