Why are those round type mufflers always mounted sideways?

Those round can shaped mufflers are always mounted pointing slightly sideways. Why? And why are they only on certain cars such as hondas subarus mitsubishi evos and dodge neons

A sideways muffler provides some energy absorption in the event of a rear-end collision. It's an extra "crumple zone" that protects the gas tank.

Hi the muffler is designed to fit certain makes of car as they all all individual.

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