If you are swapping metal parts for carbon, yes you get decent weight savings between the original and the CF. Not so much with plastic parts. When I swapped my dual exhaust end cap I weighed it for the fun of it, and the metal was 750gm, the carbon replacement was 165gm. So in swapping all my parts out, I had the two exhaust caps and the air intake plenum in metal. I may have saved a kilo in total. If you want to save more, losing the catalytic converter box is probably the biggest saving you can easily make...