All this stuff was weighed on a cheap bathroom scale, so I can't attest to the accuracy, but here it is:

Racing Beat header - 18 lbs
Racing Bear pre-silencer - 12 lbs
TII transmission - 82 lbs
NA transmission - 78 lbs
NA driveshaft - 10 lbs
Mazdatrix TII to NA driveshaft - 14 lbs
NA clutch, pressure plate and flywheel - 34 lbs
ACT HD pressure plate, MM clutch disk, Pro-Lite flywheel and S5 counterweight - 29 lbs

stock front fender - 8 lbs 10 oz.
Origin 25mm front fender (painted) - 5 lbs 15 oz