Check out this thread:
http://www.golfmkv.com/forums/showthread.php?t=173708
It's on a Mk5, but same info applies to the A3. You'd need transmission with rear driveshaft output, Haldex diff, entire rear subframe from AWD car, new gas tank and 2nd fuel pump, weld in rear floor pan from quattro A3, new downpipe, wiring and coding to get everything working, and plenty of odds and ends I'm not thinking of. I hate to be one of those guys (because I'm all for unique projects and custom work) but you may as well sell it and pay the difference to get one that came with quattro. Even if you buy everything secondhand and do all if the work yourself, you've got to be looking at $5k+
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