If you wish to execute fixes for your BMW R 1100 S then it will always be a good idea to own a Workshop Manual to keep just for personal reference in case that you want to know tips to remove a certain part much like the Exhaust and fit it again adequately.
BMW R 1100 S Workshop Manuals gives you distinct diagnostic guides on your car or truck so if something is not working it helps you determine what the situation is and easy methods to correct it. After that you can evaluate if this can be achieved yourself or in the event the job is simply too big you could book your R 1100 S in with a suitable garage.
BMW R 1100 S manual