Hi

I said Cat back, leave the Cat in place... As you said it will fail the MOT and on a N/A focus it will not amke a huge amount of diffrence anyway.

All focus's have 2 silencer boxes. If you put a good quality stainless steel exhaust on they make them more free flowing, hence more noise.

I would recommend Piper, Magnex, Mongoose and Miltek.

As i understand the Mongoose and miltek use only the center box and no rear silncer so thay are louder...

Regards

Tom aka Zippy