Originally Posted by djnicholls
Where each of the 4 exhaust pipes come out and join together to go back under the car, there is a metal plate about 30cm x 45cm in size with "caution hot" embosed on it, covering them. Hope that explains it better

Im still new to the world of mechanics.
Ohhh okay, that's the heat shield. Don't worry about it unless you want to replace it for aesthetic reasons.
This site is for people new to mechanics, good job doing this stuff yourself