Daniel Esposito competes in slalom racing with his Fiat Cinquecento. The 600 kg race car is powered by a 998 cc inline-four from a Kawasaki Ninja ZX-10R motorcycle. The engine’s 190 horsepower is sent to the rear wheels through a sequential transmission. Watch as the little car compete in the Proto P2 class at Castelletto di Branduzzo circuit.
Below are a few videos from Daniel’s YouTube channel in 2017.
Source: Italiansupercarvideo
the sequential transmission seems to be just the standard box from the bike, not a fancy race box.
I am sure you are correct but I couldn’t confirm that.