[Baffler]

The seats and sound proofing just fold forward with no need to remove. You'll see the quick release on the outlet and return...just push back the plastic tabs and the pipes should slip off with little or no effort. Have a few clean rags to hand to catch any spills.

There is a special 'H' type tool to remove the ring but most just use a suitable piece of lumbar with a light tap of a mallet alternating sides until it comes loose. Anticlockwise to remove. The ring is much tighter on petrol variants due to the effect petrol has on plastic/rubber over time.