It's easy mate, if I can do it anyone can
Have a look underneath at the back boxes and you'll see the vacuum units that operate the flaps. Shine a torch down the inner pipes on both sides and you'll see the flaps. Wedge them open and wire the linkages in that position with a piece of strong wire, job done. Probably easier with an extra pair of hands but once you take a look and understand how they're set up it'll make sense.
A8 Doc posted some pics in the relevant D3 section back in 2011 so take a look at them if it'll help.
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Audi D3 S8 - 2007 - V10. B&O, Phantom Black, black and silver interior, and still completely standard with everything working as it should 
Audi TT - 2015 - Ultra
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