How we can loose near 30 kg when we "Radicalize" a Ducati ??

How we can loose near 30 kg when we "Radicalize" a Ducati ??

Original ST2 muffler: 5,104 kg (each one)

SPARK Omologated Megaphone: 1,696 Kg

WE have loose 8,512 kg  only with the  slilencer !!