If you need to perform repairs on your Honda CB 450 N then it is always recommended to have access to a Workshop Manual to use as personal reference if you want to know the best way to take off a particular component much like the Exhaust and install it again accordingly.
Honda CB 450 N Workshop Manuals provide you with special diagnostic info for your vehicle therefore if something is not working it helps you work out what the issue is and the best way to repair it. Then you are able to analyse if you can do this on your own or if the job is just too big you could book your CB 450 N right into a nearby garage.
Honda CB 450 N manual