I'm thinking about changing as much of the small silicone hose as possible as most of it is looking quite tired and the clips are knackered too. I was wondering what hoses are the most important ones to change, or the ones that tend to fail most. On another hose note, I also noticed today 2 braded hoses in the engine bay that looked quite new. One was thin and conected to a valve of some sort under the inlet minifold. The other was thicker and appeared to connect to something near the gear box. Any ideas?