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What is the function of all those fins? Catalytic converter? Sound muffling? More efficient exhaust flow?
I'm lost.
^^You're on the right track, the turbine design of the exhaust fins are supposed to create a vortex to help suck exhaust gasses out for better/more efficient engine response. They also act as a sound muffler, and as a catalytic converter.. They also use the same style exhaust on Honda's HSV-010, here's a few pics..