Some of my favorite cars to look at are special builds from manufactures to serve a specific purpose or person. One of those purposes is diplomat cars and all the crazy modifications they receive compared to the normal civilian version. Today, we have an already special 1978 Mercedes-Benz 450SEL 6.9 that was modified for Juan Carlos I during his rule as King of Spain. This M100-powered S-Class is fully armored and a rear sunroof was added so he and his wife, Queen Sofía, could stand on the rear seats to wave at people during parades and events. This W116 was also equipped with the customary flag holders on the front fenders and a siren to alert all the mere normal citizens to get out-of-the-way. But now, Juan Carlos I is 80 years-old and while he still gets driven around in a S-Class, he also prefers some faster toys too.