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Best Exhaust For Nnbs? Single Vs. Dual


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#1 lenard13

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Posted 27 February 2010 - 10:27 AM

I have an '08 Sierra 1500 with a 5.3L. I installed a DI/DO magnaflow muffler with an x-pipe in the muffler. I had the stock y-pip cut and had dual piping from the cats and a dual exit infront of the right rear wheel. I feel like I've lost bottom end power. I need some input on what setup would be best. Thanks

#2 dlr328

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Posted 27 February 2010 - 01:36 PM

I have heard that aftermarket exhaust kills your bottom end...that is why I just replaced the original muffler to a flowmaster..sounds sweet and still have the low end torque...
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#3 C. Charles Hahn

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Posted 27 February 2010 - 01:58 PM

I have heard that aftermarket exhaust kills your bottom end...that is why I just replaced the original muffler to a flowmaster..sounds sweet and still have the low end torque...


This is true of duals; usually a single exhaust is OK.

My understanding is that unless you have forced induction, there's no real need for duals as these engines do like a little bit of backpressure and dual exhaust eliminates too much of it.
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#4 sc4808

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Posted 27 February 2010 - 05:13 PM

Stock Exhaust is the best option.
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#5 Z'06

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Posted 27 February 2010 - 10:02 PM

As stated above, no need for true duals unless you are supercharged and shooting for a couple hundred HP over stock. The stock cam in a normally aspirated truck is too anemic to generate sufficient intake and exhaust.

Edited by Z'06, 27 February 2010 - 10:45 PM.

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