A common misconception is that the larger the diameter, the better the system. But, bigger isn't always better. Systems that are too large in diameter can actually hurt performance.
As a general rule, switching to a performance system that is 1/4" to 1/2" larger than stock will provide you with the best horsepower increases. To determine which pipe diameters will be best for your system, decide what RPM range your engine will operate at, most of the time. Smaller diameter pipers will produce low to mid RPM torque. Larger diameters produce mid to high RPM torque
As a general rule, switching to a performance system that is 1/4" to 1/2" larger than stock will provide you with the best horsepower increases. To determine which pipe diameters will be best for your system, decide what RPM range your engine will operate at, most of the time. Smaller diameter pipers will produce low to mid RPM torque. Larger diameters produce mid to high RPM torque
![](http://img187.exs.cx/img187/6285/exhaust4eh.jpg)
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