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True Duals

True Duals

Postby 2009silvderadodb [OP] » Jan 10 2020, 8:27am

Hello, my name is Ryan and I recently bought my dream truck(not new). It is a 2009 Silverado only 2WD don’t really need the 4x4. I’m nineteen and really want to take care of it. However I also want to get true duals done and a nice exhaust. I have a set thrush glasspacks that I want to put on it. But I want to make sure the exhaust is set up safely and will not turn any lights on under the dash. So what can I do, what should I watch for, and what is the best route I should take while doing this?
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Re: True Duals

Postby GBSierraSLE » Jan 10 2020, 3:04pm

Welcome, Ryan!

True duals are really not going to gain you anything performance wise or the like. If it was my truck and I wanted to use that muffler, I would have the stock muffler cut-out and have the Thrush welded in it's place. There are better choices out there for mufflers but if that's what you have on hand and want to use it, that's what I would do.
And as long as you don't mess with the cats or O2 sensors, exhaust will not trigger a CEL or set any codes.
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Re: True Duals

Postby Bradley21sanders » Jan 10 2020, 3:32pm

I agree with the guy above
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Re: True Duals

Postby 2009silvderadodb [OP] » Jan 10 2020, 5:16pm

I understand that they won’t gain me anything, I just really love the sound of them, but I’ve heard that if I run true duals it will cause a CEL to pop up because of the sensors. But I see people with true duals all over the place.
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Re: True Duals

Postby 19trax95 » Jan 10 2020, 8:59pm

You wont have any issues as long as you keep the cats and sensors intact. As far as the ecm is concerned, anything after the downstream o2 sensors it doesnt know, or care much about.

I will warn you though, glass packs do not sound good on these trucks. Neither do true duals. If you want the look then you can get dual rear exit exhaust, but still have the single in dual out muffler.

If you want duals still I'd add in an X or H pipe to help balance the sound a bit. Especially with glass packs.
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Re: True Duals

Postby plant.one » Jan 10 2020, 9:22pm

2009silvderadodb wrote:I understand that they won’t gain me anything, I just really love the sound of them, but I’ve heard that if I run true duals it will cause a CEL to pop up because of the sensors. But I see people with true duals all over the place.


it'll throw codes because of the O2 sensors.

without those, your vehicle is going to freak out. its how these trucks are designed. they need that info in conjunction with the MAF to determine how much fuel they're supposed to deliver. The day's of just swapping out exhausts from front to back just because are long over with the advent of modern fuel management systems. Thank the EPA and CAFE standards put in place by the govt.



so unless you've got a buncha money to throw at the issue to have a whole new fuel management/computer system put in to run your truck (way way way more than the exhaust is going to run you) you're going to be better served doing a cat-back modification and installing a single-in/dual-out style muffler to give the look of a "true dual" - which to be honest is probably what most (>90%) of what you're seeing on the street with dual pipes out the back are built on.

you can still get great sound - as loud or as quiet as you desire - from a setup like this, and your truck will operate how its designed to as far as the fuel/air management. and nobody who isnt crawling under your truck will never know you're not running a full dual exhaust.

there are dozens of threads on here comparing the various exhaust options for these 2007.5+ vehicles.

good luck and let us know what you end up with!
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Re: True Duals

Postby 19trax95 » Jan 10 2020, 9:31pm

You can do a 100% true dual setup using the stock manifolds and cats. Just requires some basic pipe fitting and welding. No CEL worries.

Just dont mess with anything above the downstream sensors.
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Re: True Duals

Postby Bryzzo61 » Jan 20 2020, 1:34am

I looked at true duals as well. I eventually called Stainless Works and spoke to one of their engineers about this. He basically told me that you do t get the benefit of true duals until you are getting in the neighborhood of 700 hp.
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