Bent exhaust pipes

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Yes, diesels blow nasty particulate matter and by law in some areas must point toward the ground. Gasoline engines don't have this extra bend as it robs power/efficiency.

If it points upward and doesn't have a cover like most semis, water could get in and cause blockage or even hydrolock the engine.

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>Gasoline engines don't have this extra bend as it robs power/efficiency.

I forgot but in what case does an engine need exhaust-back pressure?

No, the bend creates pressure which means the gas needs more force to be effectively exhausted, resulting in lower power output to the wheels.