I recently replaced my speakers and installed a "Cleansweep" and amps. This is on a B7 S4 that has Bose and Nav from factory. After the "upgrade" I get a bad hissing sound and one of the speakers chitters. The shop claims that this is because of the way that Bose stuff is designed. So, 2 questions:

1. is there a way around the Bose issues?
2. if I end up replacing the entire head unit, is there one that has Nav, XM, will work with the stock CD changer, and will work with the stock steering wheel controls?

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Revo ECU (software)
Milltek intake, downpipes and catback
Bilstein PSS9 suspension; Neuspeed rear swaybar
BBS RGR rims; 245/35/19
20% tints all around