I see someone selling one of these on Ebay and wondered if it's worth getting and what the advantages would be over the standard unit?

Current Mods are;

Evo chip and better plugs
3 bar fuel reg
K N panel filter
Ragazzon straight through centre pipe and rear box

A super 60 will flow more air = more power to be made.
trim60 + walbro 255L/h pump, 3bar regulator, FMIC, and freeflow exhaust = 280bhp

With a decent chip the power curve will be somewhat like this (but without the dip at 4200rpm:
http://www.lanciahf.eu/images/ECU/delta-mobster.JPG

I've got the ecu programming for the super60.