Does modifying the exhaust affect fuel consumption?

[Arya]

Modifying the exhaust pipe does have a certain impact on the engine's fuel consumption. The following is the expanded content: The impact of the exhaust pipe on engine fuel consumption: From the engine's four reciprocating actions—intake, compression, explosion, and exhaust—if the exhaust pipe cannot quickly expel the burned exhaust gases, the subsequent intake stroke will inevitably fail to rapidly and completely draw in fresh air. Especially at this moment, the residual exhaust gases in the combustion chamber will also affect combustion efficiency, and the horsepower performance will naturally be unsatisfactory. This is the purpose of modifying the exhaust pipe. The impact of exhaust pipe damage on fuel consumption: Damage to the exhaust pipe reduces exhaust resistance, and smoother exhaust flow creates space for intake, thus increasing intake. Increased intake leads to higher fuel supply. The smoothness of the exhaust pipe, i.e., the internal resistance of the exhaust pipe, is related to the design of the exhaust manifold, the diameter of the mid-section pipe, the overall length of the catalytic converter, the bend angles, and the size of the muffler. These factors directly reflect on the exhaust efficiency. The main purpose of modifying the exhaust pipe is to reduce backpressure, allowing smoother intake and exhaust. This also indirectly extends the valve overlap time to enhance breathing capacity, thereby altering the engine's characteristics and improving the response power in the rev range.