NA 1.8 Exhaust Options

[Bispal]

I have a 1997 1.8i which needs a new exhaust back box. It has the longer cat at 475mm which seems to be difficult to source. Can anyone recommend a good exhaust that does not add noise or drone. I don't mind if its a little 'tuneful' but can't tolerate any additional noise / increase in db, of course an increase in BHP would be fine :-)