Can anybody please tell me what's that red thing in the rear of the sesto elemento?

This is the transmission.

Looks like diff to me

Umm..brake lights?

Parachute

I’m not sure too but it has in all Lambor (modern one) if you took out the rear bumper and u’ll find it

Emergency rocket booster.

Prob the rear diff

Diff I think

Parachute

Its the transaxle the diff and trans mission are together