Hi, I going to be getting an exhaust sorted out for my 2003 Astra SXI I'm having problems choosing the Vauxhall Irmscher back box or going full on for a full stainless Magnex system, I've had a Magnex on a car I owned about 5 years ago and it sounded like a Aston martin and really give a nice sound and looked smart. The only thing that I'm worried about is if I get a full system what happens to the CAT? does it fit into the magnex system or do they have to remove it (which I'm not sure is road legal) Can anyone help Thanks Pete