my fully loaded gt with a full tank of gas and me (180) weighs in at 3600lbs. That's with an aluminum driveshaft and dogbone removed and spare/jack still in trunk. Oh, also had an amp and 2 10" subs in a box in the trunk too (50lbs??) So 3350lbs is pretty close for a GT.
Friends GTS weighed 3200 even with a half-tank of gas, 2 spare tires and jacks and a few small handtools in the trunk. No weight reduction besides the offroad exhaust.