[Lord of Hog]

Thanks for the replies so far. Purely from a cost point of view, if the answer is to fit a factory-spec rear box or some sort of resonator to the existing ageing system then I may as well wait until the world returns to some sort of normality and have the stainless cat-back that I was quoted around £300 for. When I had one from the same people for the Outlander I was able to specify what sort of exhaust note I wanted and they removed/moved resonators and changed tailpipes accordingly.

However, now I'm obliged to work from home half the time I hope to have the opportunity to continue playing with it. So if I stumble across any undiscovered answers I shall let everyone know.