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For those who swapped mufflers - question

Waterfowler41

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Waterfowler41 Senior Enthusiast

Waterfowler41

Posted
Posted

2014 GMC Sierra SLE 5.3

 

After searching high and low I decided on a custom exhaust system fabbed up at a muffler shop versus a full cat back system. This is the first time I am hacking up the existing system rather than bolting on an aftermarket system like Banks or MBRP.

 

I've narrowed it down to the Borla Xr1 muffler 40085 and the Summit "Corsa style" exhaust tip.

 

The muffler has 3" in and 3" out so for those of you who have put in aftermarket mufflers where in the stock system did you place it? More forward or more towards the rear?

 

I am back and forth between having them use an adapter to put the 3" muffler to the stock diameter inlet then use 3" out the back or have them install a length of 3" leading up to the muffler then continue with 3" out the back. Thoughts? I want a deep tone so I figure the more 3" pipe in the system the better.

 

If you installed just a muffler, any lessons learned? Things you would do over? Leave the flex joint or get rid of it? I noticed Banks and MBRP get rid of it but Corsa uses a flex joint.

 

Thanks!

Rawyzf Senior Enthusiast

Rawyzf

Posted
Posted

Are you replacing the flapper as well?

 

If so, I am assuming you'll want to have the muffler exit start where the flapper is and then go as far forward as the size of the muffler. Then use factory sized pipe slightly expanded up front to slip over the existing exhaust pipe. You can also put a 2" piece of 2.75" pipe slightly expanded into the tip of the 3" muffler to get the factory pipe to fit in there pretty snug.

 

I'll attach a pic of my setup. Borla ProXS 40359 3" in and out, flapper removed.

 

fd68344bf3eb5d76f959948354907ad0.jpg

Waterfowler41 Senior Enthusiast

Waterfowler41

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Flapper will be removed since the whole tail assembly will be of 3".

 

Really my big debate is do I spend the money and have them run the 3" all the way from the flex joint into the new muffler then out the back or use the 2.75" stock pipe expanded like you said, into the new muffler, then new 3" out the back... I assume the later will be cheaper since I am asking for stainless but will I be missing an opportunity to get a deeper sound by not swapping out all of the mid pipe to 3"?

 

decisions decisions...

Rawyzf Senior Enthusiast

Rawyzf

Posted
Posted

I don't think 2.75 vs 3 is going to make much of a sound difference.

 

Muffler choice and resonator keep/delete are going to drive that sound.

 

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Harbinger Enthusiast

Harbinger

Posted
Posted

I threw on a Flo Pro Twister onto my truck and immediately hated the V4 drone. Without that flapper you will hate your life. Days later I got the truck custom tuned so it doesn't drop to V4.

sdeeter19555 Senior Enthusiast

sdeeter19555

Posted
Posted

I thought by keeping the muffler as far back under the bed, and not under the cab, would help reduce drone? I replaced the factory muffler with a MagnaFlow 3.5 in by 3.5 out in the factory location.

 

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Waterfowler41 Senior Enthusiast

Waterfowler41

Posted
  • Author
Posted

I thought by keeping the muffler as far back under the bed, and not under the cab, would help reduce drone? I replaced the factory muffler with a MagnaFlow 3.5 in by 3.5 out in the factory location.

 

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I've heard that as well. So I think I'll be throwing the xr1 right where the stock muffler sits then they can fab up the rest out of 3" stainless to the back out the summit tip.

 

 

 

 

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Harbinger Enthusiast

Harbinger

Posted
Posted

I thought by keeping the muffler as far back under the bed, and not under the cab, would help reduce drone? I replaced the factory muffler with a MagnaFlow 3.5 in by 3.5 out in the factory location.

 

Sent from my SAMSUNG-SM-G900A using Tapatalk

 

That's exactly where my muffler is. Just be warned haha

 

Mine is also a racing muffler so maybe because it's louder it's more noticeable.

sdeeter19555 Senior Enthusiast

sdeeter19555

Posted
Posted

I get no drone, definitely louder but not obnoxious. I used the stock tailpipe, so it dumps completely out from under the truck.

 

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