I've been crawling around the car today, armed with my phone and good old ears.
I think I've found the source, and it's not the replacement flexi joints. The exhaust is not a single piece from the flexi joints to the rear of the car.
After the flexi joints, I have another section of exhaust with a silencer for each bank of cylinders and then just before the box that connects both bank of cylinders together I have another joint. The picture below from A8parts shows that joint, and I believe it is blowing from one of those joints. I've also attached a photo taken under my car of the offending connection, but nothing is obvious. The sound is definitely coming from here rather than the front of the car.
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Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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