the original 32 gtst loom is around 25kg including all the small ecu and control units. bens targa car had to have a fair bit of stuff added over the top of what was stripped out plus it still runs electric windows and mirrors ect.
once you have stripped a car of the easy cheap to remove weights it is hard to find 16odd kg on one area that doesnt cost a bomb so we are pretty pleased with the result.
im yet to do a r33 so im not sure what the starting weight would be.
aparently the r35 has a tun of wiring weight but because of its complexity no one has tampered with it much.