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If your talking about straight piping a car's exhaust, then it has pros and cons. Straight piping can increase the horsepower and torque of an engine by allowing it to breath better (you can draw more air in if you can get it out faster). It also makes the car sound louder and more powerful.

The bad thing is that straight piping normally includes cutting off the catalytic converter and muffler, and replacing them with one exhaust pipe that runs from the headers to the tail tip. Many states require emissions tests on all vehicles up to 25 years old, and if the catalytic converter is gone, that car will never pass inspection. Cars made after 1996 have computer programing that monitors the efficiency of the catalytic converter, and if it's gone, the computer will turn on the Check Engine light and can even alter the engines performance. If your car has a Back-pressure Exhaust Gas Recirculation (EGR) valve, and you change anything in the exhaust that will lower the back pressure, it could cause the EGR valve function improperly, with will affect the performance of the engine.

I would recommend you run straight pipes for a higher performance car, but not for a daily driver.

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