抛开制造成本等因素不说，通常原厂车型在设计的时候会考虑到发动机输出特性是否适合日常使用。特别是在城市道路行驶时，充盈的低转速扭矩输出可以兼顾好开省油的优点。适当的高排气回压设计可以保证发动机低转速高扭矩的输出特性，但是这种设计的排气系统会在高转速状态下形成阻力，导致功率发挥受阻。而改装排气通过设计、材质的不同来降低排气回压，同时可以提升发动机的进气效率，以达到提升功率输出及改变扭矩输出特性的目的。
it is not said that the cost of manufacturing, usually in the design of the original model, will take into account whether the engine output characteristics are suitable for daily use. especially in the city road, the filling of low speed torque output can give consideration to the advantages of saving oil. the appropriate high exhaust back pressure design ensures the low speed and high torque output characteristics of the engine, but the designed exhaust system will form resistance at high speed, which will cause maximum power to be blocked. the modified exhaust can reduce the exhaust pressure by design and material, and improve the intake efficiency of the engine at the same time, so as to achieve maximum power output and change the output characteristics of the torque.
本文由济南大伟车服务有限公司（济南汽车租赁公司，济南租车公司）http://www.jndaweizuche.com/整理提供

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吕先生
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