Hi Si and welcome.
As the life expectancy of the original exhaust is 12 nanoseconds, most people change them for an aftermaket pipe, or get them camcoated under warranty. A tensioner is considered necessary to prolong the life of your belt, and most folk opt for a tail tidy to enhance the looks to the detriment of performance (meaning that if it rains your back gets wetter than your front). Frame pucks and crash protectors can also be of benefit.
There is a monthly meeting at Squires in Sherburn this Thursday, and if the weather is nice there will be a selection of bikes you can view, and we can answer your questions face to face.
Hope to see you there, although you won't have the honour of meeting the giant green imp as she is working this week!
