Weight obsession - part weights on S13

[Def]

My car is not my DD, I don't care if it's a little more uncomfortable on the street at this point since I have solid EVERYTHING. The diff noise is the loudest thing in the car on the track to give an idea of how "not comfy" it is. I have no sunroof, manual doors.

The AC evap is out, it weighed ~6.5 lbs. The front bumper support I built was right around 6.5-7 lbs for the whole thing made out of aluminum. A little heavy, and I could probably make it again and get it down to about 4-5 lbs, but oh well, it's strong as hell(and held together with titanium bolts - budget baller style).

Is the rear hatch all that heavy? I currently have my wing mounted on there, and I even used about 1-1.5 lbs of aluminum stock to really strength the deck lid(it was flexing quite a bit. A FRP hatch would probably not stand up to the wing without SIGNIFICANT strengthening, and at that point, probably not too much lighter than stock. I can see a few lbs there, but I'd rather not be dropping hundreds of bucks for a few lbs at this point(I'd get an aluminum driveshaft if that was the case).

So anybody know how much the rear hatch glass weighs? Trying to get an idea of weight savings.

I'll keep the heater/HVAC stuff if it doesn't weigh too much, as it is nice having heat and defrost.

I'm not really going to cut away huge parts of the car to start saving 10 or 15 lbs. I drive the car to the track, need storage for that, and don't need to get completely crazy.

Not going to spend the money on CF/FPR doors either - at that point I'll just gut the stock doors(which I'm going to do slightly, not sure how much weight there is to be lost and keep at least some side protection).

My realistic goal is to get the car down to 2450 lbs with a ~10-15 lb heavier cool shirt setup than I have(currently 12-14 lbs, not enough ice capacity when it's 100 deg F out here).



This is what the car is like currently on street tires:

YouTube - 100 1011mp4