I would assume the following guesses, keep in mind its German

sound deadening and undercoating - 100lbs
Gutted interior carpet seats door panels etc.. - 250lbs
A/C System - 50lbs
Stock exhaust - 120lbs
Stock wheel savings - 20lbs
14.5 gallons of gas - 90lbs

That would be about 630lbs off the stock curb weight bringing it down to 2600 lbs. The other thing to keep in mind is the amount of torque that car has stock which is 170. To be classed in A I believe that the curb weight would have to be higher closer to the 01-03 ACR Neons at 2780. The first gen DOHC Neons only made 150HP & 133TQ. The 01-03 ACR's made 150HP & 135TQ. Also keep in mind that the 2004 Mazda 3 is classed at 2840lbs with the 2.3l at 160HP & 150TQ.

I would think that somewhere in the 2800lb range would be the correct weight for the '05 Jetta.