This is a custom 456. It has a different diffuser and 550-style headlights. Also the air intakes. There is very little known on this car but it's almost certain a one-off.
This one is tuned by Novitec.
@yannick-m. how do you know? Novitec never made a kit for it and the Novitec wheels that are on this one are newer than the 456.
If she is a Novitec Rosso, an extremely rare find.
Wow, nice find. Customized by a tuner that was not very well known yet at the time of this car.
the sticker on the back:
"cartech.ch Autotechnik Chur"
rare spot, voted for the spot of the month