The silencer has been mounted to the roof fitting and Dave has constructed this tidy exhaust incorporating in 2" BSP from engine upwards:
Hand made flange to engine manifold.
Large radius bend. ( cheap from the farm shop)
Two couplings welded together to get the correct length.
Flexible section to allow a small bend and vibration in use.
Union to silencer bottom.
Yes the silencer coupling is slighly cockeyed but it will eventually be wrapped in insulating tape to protect against burns if touched.