This is as close to a 930 Lightweight thread as I could find to start posting on, so here goes:
My current weight is 2533 with about 1/2 a tank and the spare tire in the frunk.
Lightweight mods:
A/C removed (except for front blower ducted to the three dash vents)
Fiberglass bumpers with all bumper shocks removed
Recaro PP seats
Heater automatic controls removed (now single heater lever between seats)
Rear seats removed
Sound deadening removed
RS carpet kit with lightweight foam on rear panel
RS door panels
Various wiring removed related to A/C and heater
Electric radio antenna removed
Windshield washer system removed
Lightweight starter
Lightweight clutch & flywheel
A bunch of stuff related to EFI system including original engine wiring harness
Future mods:
Replace current full bay 30lb intercooler with lighter low profile cooler
Replace whaletail with fiberglass ducktail
Remove sunroof
Replace tail lights with 3D printed housings and LED lights
Replace rear wiring harness with minimal harness
Replace 965 fiberglass bumpers with something more '79 period correct
I'm looking for other ideas.
