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Special engraved Akrapovic verification code on the muffler inlet cap.

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Why do internal combustion engines, either 4-stroke or 2-stroke, even need exhaust systems?

Internal combustion engines need exhaust systems mainly for the following reasons:

to improve power and torque delivery characteristics,
to lead hot combusted exhaust gases away,
to muffle the sound, i.e. reduce noise emissions (where the intended use of the engine has to be taken into consideration).