2005 mk2 octavia 2.0 tdi dsg estate exhaust

My exhaust has just started to blow from the front somewhere carnt be shore where it's raining to hard for me to have a look.can anyone tell me how many pieces is my exhaust is in I.e front/middle/back ?

and with the blowing noise coming from the front third of the car is there a place that they are known to go more often than not?

Cheers kev.