Noticed it about a week ago. It's generally in the lower gears that i notice it. Isn't that loud, but certainly louder than what it was a week ago. When i start it up & go through the first couple gears (it seems especially 2nd) it just sounds, well, farty.
The only time i've driven a car that sounded similar was when i had my petrol Escort right before the exhaust fell off (except in that case, the noise was loud building up to it).
The backbox appears slightly rusty, but nothing major (i think). Can't speak for the rest of the exhaust system as i can't see.
Was undecided on getting a decent exhaust system put in place, but as say .... i'm undecided.
I imagine on the sparse info i've given, there could be any of 101 different possiblities??
Car has done 112k. FSH but no idea when the exhaust was last changed. Is it likely to be coming to the end of its life?