Magnum P.I. is one of the greatest TV shows to ever be produced, it melded together a great regular and guest cast, fantastic Hawaiian scenery, fantastic plots, and one of the best 2-seat sports cars to ever be produced - the Ferrari 308 GTS. The Ferrari 308 GTS made its debut for the 1977 model year and lasted until the end of the 1985 model year. Magnum P.I. The Magnum P.I. Ferrari 308 is just as popular today than it was in during the 1980s.