I did think about that before. You can remove some weight but will not be significant. Maybe 50kgs the most.
- carbon fiber bonnet
- rear brake light spoiler
- spare tire
- boot lid cover & curtain
- rear boot insulation
- rear head rest
- sunroof n moon roof glass to plastic
If you want more, convert to FF. That will reduce 100kgs.
More extreme, audio, aircond, power steering, dashboard, seats n replace with cf seat.