I have a used carbon fiber drive shaft for ae86 gts fs (may fit other models). It weighs about 14 lbs. iirc. I got it from Yves at K1 Motor Works a while back. I'm selling it because I need the money for other things. I hate to see it go.
*Required: new holes need to be drilled on gts pinion flange to match carbon ds*, aside from that's it's a direct swap.
$550 (includes paypal fees and shipping with insurance to lower 48 states). It will be packaged like a tank.
