318is, is it a cat or a muffler box???

[Matt_M44is]

Just trying to establish if the front most box on the 'is' is just a silencer or a cat ??

Didn't think all came with cat's.

http://www.realoem.com/bmw/diagrams/a/102.png

^^ thats a pic of the part which is refered to as Cat/Silencer ...

Bit of advice would be great thanks guys

[Matt_M44is]

Solved my own problem as its a silencer or a cat but looks the same