ELI5-Why does your car lose power when you cut the exhaust

Question

ELI5-Why does your car lose power when you cut the exhaust

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Answer 1

Cut it how? The exhaust is engineered as part of the motor,with back pressure and flow part of the whole process, so changing part of the exhaust changes the dynamics of how the engine and the electronics that control it work. (I Am Not an Engineer)