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Exhaust 5.7 HEMI Exhaust Discussion


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Old 02-01-2011, 01:24 AM
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Default Exhaust Question ...Single vs Dual

Is there a "Real" Benefit to a dual vs Single exhaust system? I'm talking outside of "looks" and "Sound" I mean performance...
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Old 02-01-2011, 01:34 AM
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From Auto Anything:

"If your vehicle has a stock single exhaust system (if there is only one head pipe running from your engine back to the muffler) and you install a dual exiting exhaust system, you will get the same intense boosts in horsepower and torque as with the single exiting exhaust.

The major difference between single and dual exiting exhaust systems is the number of tailpipes: the single has one tailpipe, and the dual has two. While the tailpipes augment your vehicle's style and attitude, they do not improve the performance of the exhaust."
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Old 02-04-2011, 08:07 PM
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I think the most performance comes from a "true dual" setup. 2 head pipes & 2 mufflers.
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Old 02-04-2011, 08:35 PM
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Per Magnaflow regarding cat-backs:

Question: Does a dual cat-back exhaust system perform better than a single?


Answer: In most cases a single exhaust will give you better torque and horsepower. The exception would be a heavily modified engine.

Per Magnaflow FAQ's /pipe size:

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 the job.

To reduce additional backpressure, the OEM exhaust tubing can be replaced with mandrel-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 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


SOOOOOOOOOOOOOOOOOOO, Are duals a necessity????? Not if you have the right sized pipe for your application.

Last edited by HoustonHemi; 02-04-2011 at 08:43 PM.
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Old 02-04-2011, 08:49 PM
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I agree, I went with a new, better flowing Y-pipe from the cats back into 3" split out of the muffler to 2 1/4 on each side. Both the Y-pipe and muffler came from Magnaflow. Check it out. Video and pics.
http://ramforumz.com/showthread.php?t=71908
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