Hi does anyone know what a exhaust rear silencer/back box replaced and fitted should cost at an independent garage?

I've got a standard 1.0 ecoboost (not a Zetec or sport exhaust).

My silencer has cracked along one of the joins and is leaking sooty water and making blowing noise when driving.

 

Can just the silencer be replaced or does a large section of exhaust need replacing too?

 

 

Thanks

Usually just the backbox, they usually come in sections rather than a whole system - what mileage is the car on btw? Seems odd to already have gone through an exhaust!

Thanks.

My Fiesta is an ex-AA learner driver car, just over 50,000 miles on clock.

On the end on the back box closest to the front of the car, it has a lipped edge which seems to have slip through as it's blowing out sooty water on the bottom edge of the rim.

 Here are some pics of my exhaust.

It seems to be the drain hole at the front of car end of the back box. It's all rusted and covered in thick soot from the draining water mixed with charcoal.

I've got car booked in next week to get it checked out.