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  #11  
Old 07-08-2010, 12:57 AM
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OneSickHemiRam OneSickHemiRam is offline
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Without a X-Pipe of H-pipe(boo) your going to lose massive low end torque.
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  #12  
Old 07-12-2010, 12:58 AM
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Smitty Smitty is offline
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Quote:
Originally Posted by black magic View Post
I'd hold off until you have heard that somebody has already done a setup like what you are looking at. The reason I say that is because you may actually loose some low-end torque because of the loss of back-preasure.
The point of installing an aftermarket exhaust is to reduce back pressure; the reason for the loss of power is an improperly sized/designed exhaust system. Improper pipe size is the most common mistake when designing an exhaust system, most systems are too large for their application. Designing an exhaust system is a delicate balance between reducing back pressure while maintaining sufficient exhaust velocity.
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Old 07-12-2010, 02:52 PM
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Quote:
Originally Posted by Smitty View Post
The point of installing an aftermarket exhaust is to reduce back pressure; the reason for the loss of power is an improperly sized/designed exhaust system. Improper pipe size is the most common mistake when designing an exhaust system, most systems are too large for their application. Designing an exhaust system is a delicate balance between reducing back pressure while maintaining sufficient exhaust velocity.
I agree that it is a delicate balance that most of us don't have the funds/time to experiement with different setups to find. I was speaking from my personal experience with a dual setup. I'm sure that if I went with either more restrictive mufflers(yet better flow than factory) or smaller diamerter pipe, that I may have felt a low-end gain. That is why I suggested to find somebody who has done a dual setup on a similarly modded truck and see what they have to say. I just don't think for most applications on fairly stock trucks, a dual exhaust would produce the most gains, but is sure sounds nice!
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Old 07-19-2010, 09:55 PM
adammiller2006 adammiller2006 is offline
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the trucks already have 2 cats and 4 sensors no need for more
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Old 07-19-2010, 10:07 PM
adammiller2006 adammiller2006 is offline
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deff a x-pipe and if all depends what size pipes you go with will give you different power gains at different rpm ranges

Answer: Don't be fooled! Bigger is not better! Many people think that having the biggest diameter pipe is the best way to make power.
Not true. Due to a variety of factors, extensive testing is required. We've dyno'd extensively and our systems yield optimum power increases. Some manufacturers claim even higher horsepower numbers.

It is a fine line to reduce backpressure while maintaining good exhaust velocity. It is not about getting the biggest pipe, it is about getting a more efficient pipe diameter while maintaining exhaust velocity.

There has to be a balanced design to enhance the maximum engine output, exhaust gas velocity, and sound. For example, imagine blowing air through a straw (comparing it to a smaller diameter pipe). This would take time to release all the air from your mouth, and you would feel pressure in your mouth while doing so. Now imagine blowing air through a paper towel roll (comparing it to a larger diameter pipe). You will relieve all your air much faster and feel little or no air pressure in your mouth because of the larger capacity of the tube. This is why it is important to get the correct size piping in order to relieve backpressure while maintaining thermal efficiency.

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.
http://www.magnaflow.com/07techtips/faq/question10.asp
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  #16  
Old 12-01-2010, 08:39 AM
TonyB.95 TonyB.95 is offline
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i have a 95 1500 5.9 and i have true dual with an x pipe no muffler and i'm the loudest truck where i live that i know of right now. but my prob is that after my truck warms up my check engine light comes on and it starts runnin like i have a cam in her so i'ma be taking it to the shopp soon, it sounds great but i seem to be using alot more gas now it must be floodin up.idk
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