My garage fitted a good quality back box from their supplier - don't know which make though. It was too loud - it created a very loud drone in the whole cabin pretty much all the time. Had a headache after half an hour. Got them to swap it out for a VW OE one which was about £150 with a large discount from the delaers. Well worth it though - it now just burbles on tick over. Don't know how loud it is outside cos when I boot it I am holding on very tightly to the steering wheel (with my eyes shut - not really). I would have thought that OE should always give a good 'note' to the exhaust.
