The problem I have is that the original box has been on there for 20 years (as amaizing as that seems!) and well shot - However none of the aftermarket dealers seems to know about the frontbox - they all just talk about a cat and the 2 boxes to the rear of it - i suspect that its because this cat that isnt a cat box was only fitted for a few years on the e34 before they brought out the 24v engine, approaching 20 years ago.
That only leaves me with bmw direct which i am suspecting will require me to saw an arm and a leg off to purchase it.
so I was considering just ditching it with a straight through pipe before it falls off.
BMW 523i E39 Feb 1998 M52