Hi Ash,
Not too sure about visual mods mate but if you need any ideas regarding performance mods take a look here at a past thread of mine:
http://www.alfaowner.com/Forum/tunin...56-2-5-v6.html (Modifying a 156 2.5 V6)
Should be 'some' useful information there mate regarding speed and the such.
Welcome to the forum mate!
Darren