levitynyc

I need to get them for my Sline 2009 A-5.

Obviously, I don't know much about them, so I need some advice on which ones to get and where to get them.

Thanks

BG6

If you live where you have lots of snow you should get dedicated snow tires/wheels. Snow tires should be narrower for better traction so you'll also need wheels. If you don't get too much snow all seasons would work year around but you'll get better winter traction with snows and better summer traction with summer performance tires. All seasons are a compromise. You should never use the summer tires that came on the car in the winter. Summer tires lose allot of traction in cold temps. and in snow they become skis.
The Dunlop winter Sport snow tire are a good winter tire that also has fairly good dry traction.
Tire Rack is a good source for all the above, give them a call. Your Audi dealer might also have some deals on winter tire/ wheels.