Z4 ecu/ rocker cover advice.
 

High guys,
Another usual advice needed thread from me, just wanted to know a bit more about a z4 ecu on a v2 classic?
If anyone knows of a good link, or can give me some info on these please?

Also been trying to piece together some info on the engine in my 2nd motor, it didn't come with much history, but was told it might have a Sti engine in it.
But it doesn't have red manifolds, but was pointed out it has a fifth injector hole.
It also has 4 cam 16 valve written on the rocker covers, if anyone can shed some light on this it would be very much appreciated.
As this will be my daily runner soon, and the Sti spec d will be going up for sale.
Thanks