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Performance Advantage with MagnaFlow

NO CHAMBERS, NO BAFFLES,
NO LOUVERS, AND NO RESTRICTIONS

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.

Engine Size

Horsepower

Muffler Inlet / Outlet Size
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"