I did a bit of work on the engine with my Ferrari Enzo model:
As you can see, I painted the cam covers red and put "Ferrari" on them as well as adding more wiring and painting the heat reflective wall in front of the engine. I also fitted some torsion bars and the prop rod that the real car has in the hole between the shocks (see second pic).
I haven't completely finished yet as I have yet to add the carbon fibre detailing but I'll try to get this done tonight and have pictures ready for tomorrow. :cheers
If you haven't seen it already, you can see part 1 of my Enzo mod here