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Suggestions For Muffler Trial

ProModMike

By ProModMike
in Engines & Drivetrain

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ProModMike Enthusiast

ProModMike

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Gents, quick update. out of the mufflers we grabbed yesterday, it seems that a MagnaFlow 14239/14264 is an ideal configuration for the way the factory exhaust is routed. Since the exhaust turns up and towards the driveshaft in front the of the muffler, having the offset inlet makes that connection much easier and since the factory muffler has an offset upwards, but center outlet, having the offset outlet and mounting the muffler at an angle across the center axis of the truck allows you to tie right back into the factory pipe out. Having relocated the flapper valve upstream of the muffler requires a short "patch pipe" to make up the distance and difference in length. Has anyone shopped this option/configuration?

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ProModMike Enthusiast

ProModMike

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We had time to test 3 mufflers. The 12229/14229, and the ProXS so far. Our current configuration is with the resonator still in the stock location and the flapper valve UPSTREAM of the muffler. The Borla has fantastic growl to it as it should. It didn't drone at all in the cab and was nearly silent at cruising speeds, but for some reason, and I'm working on what to play with to see if I can pinpoint what effects it, the V4 chopper sound was fairly prominent. Makes no sense. It's possible we need to move the flapper valve closer to the muffler to smooth the gas velocity immediately upon entry to the muffler. No noticeable seat of the pants meter increased readings. This system sounds great when you deck it. Kind of a "big inch motor-ish" kinda sound. Very bassy and rich but without the cackle gargling off the throttle.

 

The 12229/14229 was fantastic. I would suspect this would be an ideal setup for most folks. It lets you know it's there when you start it up, barely rumbles at idle outside, can't hear it at all inside, growls just a bit at take off inside, fades away as you approach cruising speed and the V4 transition is almost inaudible. Now, roll the windows down and deck it and AH HA!!! There she is!!!! Once we're done with testing, this will most likely be the system I retain permanently. I would imagine the results would be very similar, just much louder without the resonator. But our goal was to test a system to see if we could replicate what the GM Borla system delivers only at a much lower price point.

 

I'm working on compiling the measurements and editing the video right now, and I have a lot. About 30 minutes of video total. I made the mistake of recording in 4K, lol. So the rendering is taking a while and the upload will probably take 12 hours. I refuse to downscale the quality, so don't even say it, lol. The video is as subjective as any other YouTube exhaust video, but with the real time measurements and graphs next to it, you'll be able to SEE the sound. I'm hurrying, guys!!

Txjose Senior Enthusiast

Txjose

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This is going to be amazing for the community. Anyone will be able to refer to this thread when deci5on an exhaust.

6D9 Matt Enthusiast

6D9 Matt

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Awesome work bud... cant wait to see the results. I will be ordering a muffler after I see/hear some of these results.

jrob56 Enthusiast

jrob56

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Thank you for doing this, Im sure the whole community appreciates your work!

ProModMike Enthusiast

ProModMike

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Bear with me, fellas. My pesky day job has been interfering. That and during editing i realized my copilot ran his mouth a few times during crucial data recording, lol. He's been sent to the Middle East to think about his mistakes. So I had to re-record a couple things and seeing if I can splice it in without sacrificing quality. We plan to strap on the rest of the mufflers and finish testing tomorrow afternoon.

6D9 Matt Enthusiast

6D9 Matt

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The 12229/14229 was fantastic. I would suspect this would be an ideal setup for most folks. It lets you know it's there when you start it up, barely rumbles at idle outside, can't hear it at all inside, growls just a bit at take off inside, fades away as you approach cruising speed and the V4 transition is almost inaudible. Now, roll the windows down and deck it and AH HA!!! There she is!!!! Once we're done with testing, this will most likely be the system I retain permanently. I would imagine the results would be very similar, just much louder without the resonator. But our goal was to test a system to see if we could replicate what the GM Borla system delivers only at a much lower price point.

 

What is the difference in the 12229 and the 14229?

ProModMike Enthusiast

ProModMike

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What is the difference in the 12229 and the 14229?

Nothing except one is satin finish and the other is polished. 12229-satin 14229-polished

6D9 Matt Enthusiast

6D9 Matt

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spintech muffler

 

I have spintech mufflers on my Camaro... love them! Havent seen/heard them much on the Sierra though.

6D9 Matt Enthusiast

6D9 Matt

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Nothing except one is satin finish and the other is polished. 12229-satin 14229-polished

 

Ok... one last question for now.

 

So the 12229 is a 3" muffler... do they have 3.5" version of this? Doesnt the 6.2L have 3.5" piping, so a 3" would work but 3.5" would be best?

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