Engine Rattle & Loud Exhaust

Hi all

My exhaust goes really really loud and quite depp. This is only when i put my foot down in any gear.

Especially 3,4,5. My g/f doesnt get it but i drive different?

What could it be thanks??

PS it never used to do it??

Today i have started hearing a rattle like to the centre of the car in the engin bay as i put my foot down??

What sort of timing will this have belt or chain??
How often does each need to be changed

It is a Red Niassan Micra ALLY 1998

Thanks Everyone
 
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