You can find turbos and superchargers for most of the Japanese bikes these days but I haven’t seen much for Italian bikes. Koehler, a German company, makes this Moto Guzzi supercharger and it looks really nice. Of course, the Guzzi V-twin is mounted transverse in the frame so a blower just fits in so neatly. Sometimes, when an engineering project looks right there’s a good chance it works pretty well, too. This blower look right.
The Kohler site is all in German so use Babelfish to get the details if you’re interested. Looks like the kit goes for 5000 euros.
The Kneeslider: Moto Guzzi Motorcycles for sale