Depends on the age of the Caravan.
The older vans have the King equip, generally do not have much above the ordinary.
The newer versions have the Garmin gear fitted, you can option pretty much everything bar auto-throttles and super sonic flight.
Although, there was a swiss guy on a Flightsafety course last year, that literally printed money ( well 95% of the worlds currency ), he was putting a -10 garret in his float C208, certainly getting closer to Mach 1.0.