GM Performance Exhaust Muffler

shakenfake · June 17, 2022

Does anyone have a comparable muffler to the GM Performance Muffler? I am looking to redo my exhaust system and would like to get this muffler but for $1000 I don't think so lol

What Borla muffler is closest to it? last time I checked it was made by Borla but I could be wrong.

langston1726 · June 17, 2022

17 minutes ago, shakenfake said:

Does anyone have a comparable muffler to the GM Performance Muffler? I am looking to redo my exhaust system and would like to get this muffler but for $1000 I don't think so lol

What Borla muffler is closest to it? last time I checked it was made by Borla but I could be wrong.

I have the Corsa made GM performance muffler I’d sell you. It is slightly quieter then Corsa’s Touring sound level. It is the same system they put on the Sierra All Terrain X. It sounded great and had absolutely no drone but was just a little too raspy on mine with longtubes. I have just the muffler or the entire cat back if you’re interested. This fits 2014-2018 Crewcabs SB or double cabs. The catback comes with a GMC etched tip. No idea where you’re located or what shipping would be though. I’m located in Tulsa, Oklahoma.

https://www.facebook.com/marketplace/item/571743634294256/

shakenfake · June 17, 2022

That a 3"?

I have longtubes as well so not sure how raspy that would be. Especially with my next setup being a turn down lol

langston1726 · June 17, 2022

12 minutes ago, shakenfake said:

That a 3"?

I have longtubes as well so not sure how raspy that would be. Especially with my next setup being a turn down lol

Yes 3”. Exhaust sound is pretty subjective. My opinion on too raspy might be your perfect. Here is a cold start. Loud at first but gets whisper quiet after about 45 seconds

scrapen · June 17, 2022

If you have long tubes and cats are removed these trucks are very raspy. I do miss the crazy loud cold start/idle, but driving around was obnoxious. Adding the vibrant ultra quiet resonator fixed it for me.

if your turn down is ahead of the axle you may not have much room to work with to fit both a muffler and resonator.

langston1726 · June 17, 2022

16 minutes ago, scrapen said:

If you have long tubes and cats are removed these trucks are very raspy. I do miss the crazy loud cold start/idle, but driving around was obnoxious. Adding the vibrant ultra quiet resonator fixed it for me.

if your turn down is ahead of the axle you may not have much room to work with to fit both a muffler and resonator.

Agreed. I’ve tried about a dozen different set ups. Gotten tired of all of them eventually. Currently running a 14” Magnaflow with a 6” Totalflow resonator in front and a J-pipe right after to knock some of the drone down. This is my favorite set up so far now that it’s broke in. Deep, throaty with just a touch of rasp and little to no drone. Sorry don’t mean to hijack the thread.

Edited June 17, 2022 by langston1726

pokismoki · June 17, 2022

amazon has a GM bus exhaust 4" i think, high flo muffler from GM for about 100 bux . i'll see if i can find a link cheapest exhaust around for 6.2 trucks,

heres the skool bus muff

Edited June 17, 2022 by pokismoki

shakenfake · June 17, 2022

This is not actually going into a K2XX this is for my GMT-800. Posted here because K2XX is where the exhaust I want is from for the most part.

That is pretty loud off the beat. My dump will be after axle if I can fit it between the shocks. I don’t need super loud. I will have a cutout for that.

reardiff · June 27, 2022

What year truck you have? Long story, but i have a brand new, never been used GM performance exhaust for a 20145 - 2018 CC SB 6.2. It's not in the box but I have the recepit for it. I belieave the muffler is either 3 or 3 1/2 in and dual 2.25 out.

I have the exact same on my truck but ended up with two and just want it out of my garage at this point. Make and offer and it's yours, I'll even deliver it for free anywhere in the Chicago area.

shakenfake · June 27, 2022

I have a 99. Not really interested in all the piping and what not, was mostly just curious about the muffler and what might be comparable.

reardiff · June 27, 2022

If anyone else reading this is interested, PM me if interested. I'm ready to get rid of it so any reasonable offer will be accepted. All new never been installed. Have rectipt, GM part# 19303345.

Dion Fatafehi · August 28, 2022

Still available?

JONBLARC7 · September 9, 2022

Are you a 5.3 or 6.2???

I have a magnaflow 12909 on mine with no cats and headers and it sounds great with zero drone. But it's a 3.5 in and 3.5 out so it works really good in place of the stock muffler. I know a guy over on performancetruks.net that just bought a used 6.2 exhaust set up for his 5.3 and put the magnaflow 12909 in the stock mufflers place for alot cheaper that those other brands and you get a 3.5" exhaust.