If you choose to accomplish maintenance on your Kawasaki GPX 500 R then it is usually a good plan to have access to a Workshop Manual to keep just for a guide if you want to know the right way to strip off a specific component much like the Exhaust and fit it again adequately.
Kawasaki GPX 500 R Workshop Manuals gives you identifiable diagnostic facts for your car so if something is broken it will help you identify what the situation is and the way to fix it. You will be able to decide if this can be done yourself or in case the job is simply too big you can still book your GPX 500 R into a decent friendly mechanic.
Kawasaki GPX 500 R manual