If you need to do auto repairs for your Gilera RC 600 C then it is usually recommended to own a Workshop Manual to keep just for personal reference in the event that you need to know the best ways to strip off a certain component including Exhaust and match it again appropriately.
Gilera RC 600 C Workshop Manuals can offer you precise diagnostic info for the car therefore if something is wrong it will help you identify what the situation is and how you can make it better. You can then decide if you can do this by yourself or in case the job is just too big you are able to book your RC 600 C into a decent car garage.
Gilera RC 600 C manual