Hi Russ
it's probably just your rear silencer that needs repacking, mine was rather noisy until i sorted that. all you need to do is remove the black plastic end piece (a couple of screws from memory) and pull out the centre baffle tube. you will find it's wrapped in a sort of fibre wadding that will be black with oil. remove this wadding and re wrap with silencer packing (loft insulation seems to work just fine) and reassemble.
hey presto .....much more neighbour friendly.
oh by the way give the baffle tube a good clean while its out, use a blow torch to burn off the oily mess.
all the best Tim