Shanon,
There were actually 3 Luigi cars in 1976. The #1 car (mine) after winning the ETT championship was sold to Martino Finotto in either late 1976, or early 1977. Then in 1977 the team switched from Castrol to UFO livery.
Finotto had been buying seat time in the #2 car in 1976, but wanted to have his own car. Luigi, who always operated on a shoestring, was happy to have the cash. The plan was that Finotto's would still be a team car.
Then in June or July of 1977 it appears that he and Luigi had a falling out of some kind. Finotto continued to race the car in UFO colors, but was taking the car to the Italian tuner Imberti:

Vallelunga 1977
He did this to get back at Luigi, and he won enough races in 1977 ETCC to keep Luigi from repeating as champion, handing the championship to the Alpina Gosser Beer car.
There were actually 3 Luigi cars in 1976. The #1 car (mine) after winning the ETT championship was sold to Martino Finotto in either late 1976, or early 1977. Then in 1977 the team switched from Castrol to UFO livery.
Finotto had been buying seat time in the #2 car in 1976, but wanted to have his own car. Luigi, who always operated on a shoestring, was happy to have the cash. The plan was that Finotto's would still be a team car.
Then in June or July of 1977 it appears that he and Luigi had a falling out of some kind. Finotto continued to race the car in UFO colors, but was taking the car to the Italian tuner Imberti:

Vallelunga 1977
He did this to get back at Luigi, and he won enough races in 1977 ETCC to keep Luigi from repeating as champion, handing the championship to the Alpina Gosser Beer car.