Hi all, my 1st post (hello)

basically i have my MOT next month, and i have this slight probelm. my cat sometimes smells of eggs, well quite often. it doesnt ratle or anything just smells foul. seems to happen mostly when in high revs too. oh yeh, it also comes from the back box not through the vents. Any ideas? tried sum cat cleaner dont think it worked

also, if i left it like this will it get through an mot? or is it likely to fail on emissions due to the eggy smell?

cheers