The common misconception is that a straight exhaust will result in increased power. This be true in some cases if you are comparing straight exhaust to a stock muffler. But in comparison to a performance muffler, the muffler will more often than not provide more power than the straight exhaust. Furthermore, a straight exhaust system can drastically alter your power curve. The reason people tend to believe this is because common belief is that the less exhaust backpressure, the better the performance. This evaluation of the negative effects of exhaust backpressure seems legitimate. However, the truth of the matter is that gasoline engines require some degree of backpressure for peak performance and the broadest power curve. This is due to the nature of the internal combustion process. In a straight exhaust system setup, backpressure is nearly eliminated. Therefore, during the exhaust and intake valve overlap, or the time when both valves are open, precious fuel escapes through the exhaust system. This is because the area of the combustion chamber surrounding the exhaust valve becomes a low pressure zone once exhaust gases are forced out of the cylinder. As the intake valve opens (and the exhaust valve is open, but in the process of closing), fuel rushes into the cylinder and is attracted to this low pressure portion of the cylinder.

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