Comments by "" (@charlesvan13) on "Stop Saying Car Exhausts Need Back Pressure" video.

  1. Straight pipes would work better, but the amount of noise is annoying and illegal for road use. You don't want pressure in the exhaust. Pressure and restriction in the exhaust saps power, and makes the engine run hotter.
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  2. Backpressure just means there is energy loss, because the engine torque has to be used to force the exhaust out of the engine. That's torque that's not going to the wheels.
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  3. You're confusing "back pressure", is always counter productive to engine efficiency, with exhaust velocity. Higher exhaust velocity make an engine perform better a lower engine speeds. "Back pressure" has no benefits. Similarly, smaller intake runners on a engine produce better low engine speed performance, because the fuel mixture is entering the cylinders at higher velocity. It's not their restrictiveness that's causing more low rpm torque. Their restrictive size is what kills high rpm torque.
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  4. Bad. If you have to pass a vehicle inspection.
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