My 192 doesn't drone at all (with standard cat) I can barely hear much difference in the car than with the standard exhaust, though I have heard a few people say it sounds nice outside.
As for fit, I'm with the others on this one. Over the last three years I've tried and failed numerous times to line it up under the car in different ways to get the rear tail pipes to fit right and without cable ties or doing something to the rear hangers I've failed. My most recent attempt was two knackered hangers cable tied into position and then filling the spaces in the rubber with tiger seal. So far they've held up ok (about 8 months) but the positioning isn't as good as I had it just with cable ties!