Empty your glovebox, take out your spare tyre and tools, remove the cover on the hatch (mine rattled, so it is gone), remove the sound deadening from inside all the doors and under the bonnet, loose 20kg yourself, remove the cover from the Cat converter, lightweight battery, drill holes in non vital panels and trim, I'll sell you a straight pipe so you can remove that heavy rear muffler ( very loud but I think sounds better than most cannon exhaust), use shaved tyres, take out your golf clubs etc etc. My ideas for your mission.