I figured I'd start a thread for people who've weighed or measured various parts of the car or the whole car itself to post the info. Nice to have some before and after data.
Stock 18" x 7.5" Wheel - 26 lbs
Stock 18" x 7.5" Wheel with stock tire - 47.4 lbs (Dunlop SP Sport)
19"x8" Talladega with sportmaxx GT's - 54.3 lbs
Loaded 4-door - 3378 lbs (1/2 tank of gas)
Loaded 2-door - 3274 lbs (1/8 tank of gas)
Base 4-door - 3357 lbs (1/2 tank of gas)
Base 2-door - 3307 lbs (full tank of gas)
Stock hood - ???
Stock Lower Control Arm (steel) - 10.5 lbs
Passat Lower Control Arm Replacement (Aluminum) - 6.5 lbs
Stock Spindle/hub carrier (steel) - 11.0 lbs
Passat Spindle/hub carrier Replacement (Aluminum) - 8.0 lbs
Front Swaybar - 22 mm
Rear Swaybar - 22 mm
[stock Mk6 GTI front and rear sway bars, 24 mm front, 22 mm rear]
Stock Front discs - 345 mm diameter, 26.5 lbs
Stock Front Caliper - 18.5 lbs
Stock Rear discs - 310 mm diameter, 14.8 lbs
Stock Rear Caliper - ??
Stock downpipe weight - 21 lbs
Stock catback weight - 26 lbs
Spare wheel/tire - 31 lbs