NO CHAMBERS, NO BAFFLES, NO LOUVERS, ANDNO 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.
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.
