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rattle noise

  Clio MK 4
If i'm in third and put my foot down i have a rattly sound that seems to be coming from the engine on passenger side.

probably useless explaining
  Clio MK 4
is that just screwed in? Sorry i'm useless when it comes to engines. Is accessible from engine bay with out undoing parts?
  Nissan 350z
I have the same in my Clio. It also happens in other higher gears but due the speeds the rattle develops more into a low rumble noise.

My friend thinks this is being caused by the honeycomb bits inside the cat being broken and rattling around. Not being a mechanic this means nothing to me but hope this helps.