I want to change the fliters but.. I'm not sure where they are located are they inside the glove box or under the hood? TIA.

 

On all A8'sthe air filters are under the hood somewhere. On the pre-04 A8 the pollen filters are mounted on the hood, on the 04+ models, the pollen filter is under the pleanum cover on the passenger side. Then engine air filter should be centrally mounted on the engine onboth year models.