You'd need the engine wiring loom, and ECU from the JTS as well as the engine.
However, in my experience, the JTS doesn't produce the said BHP.
I've been to a couple of rolling road days, and the owners of JTS engined vehicles always had a grumpy face cos they were well below advertised power.
This could be because of the air intake though.
As said, it may be beneficial to ask in the 156 lounge, but I can't see why it wouldn't fit.
[QUOTE=Mixsynth]Apparently it has 15bhp more than the older 2.0, *stock*, which would be as good as a V6.
And it's only got a piffling number of miles on it (the donor car was rear ended).[QUOTE]
Nothing a good remap won't sort out !