it was made as legal requirement from the factory from 1993.

but that would be interesting if you could de-cat it leggaly

there is a difference. just cuz the factory have to fit it. doesn't mean you have to use it.

so anyone know which one i should go for the outline of my exhaust system, my current set up is 130/160/404 , are back boxes better bigger or smaller?

also it is off centre in and off centre out.. i did like the look of the twin exhaust so bit confused which one would fit better?

iirc off center in and out.

If you get pulled up on a VOSA exhaust check they can put you on a probition order immediately till the car is fixed i.e. has to be towed to a garage and re cat. I know they often do this in big towns and cities (seen it both in manchester and london) where they wait up a side street off one of the main drags into town pull you off the main drag into side street where VOSA are waiting to stick their probe up your exhaust to measure your emmissions. just a warning and iirc its K plates onwards that have to have cats.

us lot with the 1.6 wont get away with it. but with a 1.3 running clean, you might well do it.