Are Straight Pipe Exhausts Illegal?

Straight pipe exhausts are illegal for road use in all 50 states. However, if you leave the catalytic converters in place and straight-pipe the rest of the system, you may still have an emissions-compliant vehicle.

Does Straight Piping Increase HP?

It depends on the application and the vehicle. A straight pipe exhaust will increase the output in performance engines that need to breathe more freely. For other types of engines, the horsepower gains with an exhaust system are limited. Even on race cars, straight piping is done mostly for weight reduction purposes, and since it is an entirely custom job, there’s no way to tell the exact power gains. You have to do a dyno-test after the mod.

How Does Straight Piping Affect Fuel Economy?

Straight piping can potentially increase the fuel consumption. The lack of backpressure will cause the engine to run less efficiently, especially in the lower RPM range, increasing consumption. However, fuel economy always depends on many variables and mostly on your driving habits.

How much does it cost to straight pipe?

The cost can vary depending on the material, make/model of your vehicle, complexity of the job, and labor costs. You have to get it made out of high-quality stainless steel pipes, the complexity depends on the underbody of your vehicle, and you may need additional parts like brackets or exhaust tips. The whole job can cost anywhere from as low as a couple hundred dollars to $1,500-2,000. It is a good idea to get quotes from different shops and mechanics.

Will Muffler Delete/Straight Piping Damage the Engine?

A muffler delete is unlikely to harm the engine as long as the sensors are all in place. A straight pipe exhaust, on the other hand, removes all sensors and may cause the engine not to run correctly. The ECU will most definitely screw up the air/fuel ratio, trying to compensate for the lack of information coming from the sensors, and may cause the engine to run richer or leaner in fuel. It may still not damage the engine, but it definitely requires modification and tuning to the ECU to work properly without the sensors.

令人讨厌的响亮：直排排气系统指南

类别: Car World

更新: 2024年8月5日

发布: 2024年7月29日

排气系统是许多爱好者在他们的车辆上更换和升级的组件之一，作为他们的首个改装。由于排放标准和噪音限制，制造商在设计原厂排气系统时无法发挥其全部潜力，因此对排气系统的任何升级在这些方面都会做出一些牺牲，以获得马力和扭矩的提升。

您可以选择一个品牌排气系统，或者走更简单的路线，切掉原厂组件，换成一个称为“直通排气”的空心管。许多爱好者喜欢直通排气系统，因为它们的原始轰鸣声、爆裂声、撞击声和潜在的动力提升。主要用于赛车，但也可以应用于任何车辆，并且在汽车界一直是一个热门话题。

让我们直截了当地探讨这些 刺耳的排气系统，帮助你决定它们是否适合你。

什么是直管排气系统

排气系统包括消声器、共振器和催化转换器等限制装置。这些组件降低噪音水平并调节废气，以符合排放法规。汽车制造商优化其排气系统，以使发动机产生最佳功率、安静运行并满足排放标准。

直管排气就是它名字所暗示的：它是一个定制的中空管，从排气歧管延伸到车辆的后端，去除了所有的限制。它用一根不间断的排气管替代了这些限制，允许排气气体更自由地流动，从发动机流向排气管。更好的排气流动释放了一些马力，并且由于没有消声器或共鸣器，直管排气可以发出极具攻击性的声音。

赛车中的直管排气

一些赛车场地有噪音规定，在这些场地，即使是赛车也会安装消声器。但大多数专用赛车使用直排排气，没有任何限制，因为赛车环境通常不限制汽车的排放或噪音水平。虽然在赛车上使用直排排气并不是为了提高动力，但完全是为了减轻重量，因为赛车是被剥离到其基本机械结构的机器。

街车中的直管

在街道车辆方面，在进行直排之前有很多需要考虑的因素。虽然拥有与赛车相同的排气系统听起来很酷且便宜，但存在法律问题和噪音水平限制。另一种经济实惠地升级排气并释放废气的方法是进行消声器删除，类似于直排。

消声器删除和直排管有什么区别？

虽然直排和消声器删除看起来相似，因为它们都是将原厂管道替换为不受限制的空心管的定制工作，但它们并不相同。区别在于修改的程度，消声器删除涉及仅用直管替换一两个消声器，保留所有其他组件完好。

直通排气 意味着从排气歧管到排气尾管定制制作一个完整的排气系统，没有限制器和传感器。它可以 产生更多的动力，并且声音更大，比去掉消声器要好得多。

如何直通排气系统

任何车辆都可以安装直管排气。唯一的要求是正确的尺寸和正确弯曲管道以跟随车辆的底盘。由于这个过程需要定制管道和焊接，相对而言，自己动手是不可能的。除非你拥有工具、技能和经验，否则最好将其交给专业人士。

转换需要将从排气歧管到尾管的所有原装排气系统拆除，包括其中的任何部件；消声器、催化转换器和中间消声器。其余的工作很简单，因为只需将定制管道安装到位。一旦您确保没有泄漏且所有连接都安全，您就可以出发了——您的车辆刚刚被直排了！

直管排气的优缺点

让我们对直排气有一个全面的看法。尽管直排气看起来很酷（和声音），在决定它是否适合您之前，有一些事情您需要了解。

直管排气优点

Increased Performance: Any free-flowing exhaust system increases horsepower, although somewhat, unless backed by complimentary modifications. A straight pipe exhaust with minimum backpressure can increase an engine’s power output, especially at the top end.

Aggressive Sound: Straight pipe exhaust systems do not incorporate components to reduce the noise. With a straight pipe system, you can get the most aggressive exhaust note your vehicle can make, and many enthusiasts find this appealing. Especially if you straight-piped the right vehicle (read “something with a V8”), the loud noise will give you incredible street cred, and you’ll be the coolest kid in car meets!

Weight Reduction: Components like mufflers, resonators, and catalytic converters are not lightweight. Removing them will shave off some weight from underneath the vehicle, which may slightly help with acceleration and braking.

Simplified Design: A straight pipe exhaust is simpler compared to a standard exhaust system with cats and mufflers in place. It has almost no components that will wear out and need replacing as long as it’s made of durable, quality materials.

直管排气缺点

Legal Issues: Removing emissions-related components from a vehicle is illegal in all 50 states in the USA and many overseas regions, too.

Aggressive Sound: This is equally a con as it is a pro. The increased noise can and will bother some people, especially your neighbors in the mornings! The lack of resonators will cause the exhaust to make annoying drones and throw your vehicle’s highway refinement out of the window. It can violate residential noise regulations and lead to potential fines. It also makes crappy noises on the wrong car (read four cylinders)!

Environmental Issues: Removing catalytic converters is illegal for a reason. It increases the amount of harmful pollutants released into the environment.

Reduced Fuel Economy: Without the backpressure from the standard exhaust system, your vehicle will burn more fuel, decreasing the MPGs you get.

非特定功率增益： 功率增益只能被“预测”，因为直管排气是定制系统。品牌排气系统经过测试，提供经过验证的功率增益。

Requires ECU Tuning: Without catalytic converters and sensors, you’ll need to get the ECU tuned, too. Catalytic converters are monitored by O2 sensors, and if the sensor does not detect the cats in place, the ECU will probably throw out a CEL and make the engine run richer or leaner, trying to compensate for the changes you’ve made.

你应该这么做吗？

直管是 凉爽的; 这点毫无疑问。你将以品牌全排气系统成本的一小部分，获得你车辆能产生的最激进的声音。如果你调校并告诉ECU在没有排气传感器的情况下工作，你将获得一些动力提升，且背压最小。但你应该考虑直排的法律问题以及你在乘坐舒适性方面所做的牺牲。底线是完全由你来决定！

关于直管排气的常见问题

直排排气管合法吗？

直排气管在所有50个州的公路使用中是非法的。然而，如果您保留催化转换器，并将系统的其余部分直排，您仍然可能拥有一辆符合排放标准的车辆。

直排管是否增加马力？

这取决于应用和车辆。直管排气会增加需要更自由呼吸的高性能发动机的输出。对于其他类型的发动机，排气系统带来的马力提升是有限的。即使在赛车上，直管排气主要也是为了减轻重量，并且由于这是完全定制的工作，无法确切知道功率提升的具体数值。你必须在直管排气后进行动力测试。

直排管如何影响燃油经济性？

直排管可能会增加燃油消耗。缺乏背压会导致发动机运行效率降低，尤其是在低转速范围内，增加消耗。然而，燃油经济性始终取决于许多变量，主要取决于您的驾驶习惯。

直通排气管多少钱？

费用可能会因材料、车辆的品牌/型号、工作的复杂性和人工成本而有所不同。您需要使用高质量的不锈钢管制作，复杂性取决于您车辆的底盘，您可能还需要额外的零件，如支架或排气尾管。整个工作费用可能从几百美元到1,500-2,000美元不等。最好从不同的商店和技师那里获取报价。

消音器删除/直排会损坏发动机吗？

消声器删除不太可能对发动机造成伤害，只要传感器都在位。另一方面，直管排气则移除了所有传感器，可能导致发动机无法正常运行。ECU肯定会搞乱空气/燃油比，试图补偿来自传感器的信息缺失，可能导致发动机的燃油过浓或过稀。它可能仍然不会损坏发动机，但确实需要对ECU进行修改和调校，以便在没有传感器的情况下正常工作。