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MagnaFlow's Wide Open Performance Mufflers outflow OEM chamber style mufflers by as much as 167%. This reduces engine heat and backpressure and improves exhaust scavenging from the combustion chamber. MagnaFlow minimizes the power-robbing effects of the OEM system to restore torque and horsepower to the engine.

PIPE DIAMETER AND PERFORMANCE
Use the guide below when calculating pipe size for custom exhaust work. Keep in mind that the goal is to improve exhaust flow. In most cases, just changing the restrictive OEM muffler and replacing it with the same size straight-through, Wide Open Performance MagnaFlow muffler will do this job.

To reduce additional backpressure, the OEM exhaust tubing can be replaced with madrel-bent tubing of the same size or one size up from the OEM. As a general rule, you can enlarge the pipe diameter of your OEM exhaust system by 1/4- to 1/2-inch to increase your horsepower. However, any additional increase in pipe diameter is likely to decrease your performance; specifically, low end torque.


Bigger is not always better.


    Muffler Inlet / Outlet Size
Engine Size Horsepower Single Exhaust Dual Exhaust
150-200 CID
100 to 150
2" to 2-1/4"
2"
200-250 CID
100 to 200
2-1/4" to 2-1/2"
2" to 2-1/4"
250-300 CID
150 to 250
2-1/2" to 3"
2" to 2-1/2"
300-350 CID
200 to 350
2-1/2" to 3"
2-1/4" to 2-1/2"
350-400 CID
250 to 550
3" to 4"
2-1/2" to 3"
Use as a general guide for engine size and performance.




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