1. The turbo plugs are supposed to provide a better seal of the combustion chamber without the need of the usual copper gasket found in standard glowplugs.
2. With novarossi based engines you can just swap the button head in order to use a turbo plug. Turbo plugs were originally designed for larger engines so their temp ranges are colder than the standard plugs designed for our small block engines. So try to buy the hottest turbo plug you can find.
3. No