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Alright, before you say you don’t hear anything let me explain first. This video posted below is my 2021 Trail Boss 3500k miles and has the most annoying exhaust sound. I know there’s some serious pro’s on here who could tell me what’s going on.

 

Essentially any time I start it up high RPM, accelerate, or decrease RPM’s I’m greeted with this annoying metallic rattling noise coming from exhaust. 
 

Took it to dealer who claims it’s normal (per-usual) and says it’s the liters I can hear in the exhaust tone. They checked exhaust donuts and heat shields and found no issue.

 

However you can hear a rattle and what sounds like an exhaust leak. Was told it’s a flapper but it’s not, flapper is toward back passenger side. This is front passenger side. 
 

I could best describe it as escaping air coming from somewhere near the manifold I’d assume. Almost like a metallic farting exhaust noise for lack of better description. 
 

Videos to follow of noise while commuting. 
 

 

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Little update: Below is NOT my video though it's the EXACT sound/noise that I'm hearing when driving coming from the front end. 

I've spoken with this individual and he said his issue was the flapper. However, there's no flapper at the front end of a 2021 Trail Boss. There's only ( 1 ) right before the muffler. As you can hear in the video I posted above, the noise gets louder as I get closer to cat and slowly goes away as RPM's drop.

 

Edited by Jarid Ashman
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Alright as promised, took some videos of noise while commuting. 

I apologize the quality isn't the best but it is there and audible especially in the video upon stopping. 

Exhaust/Rattle Noise when stopping (this noise is consistent while driving too)

 

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23 hours ago, Jarid Ashman said:

Alright as promised, took some videos of noise while commuting. 

I apologize the quality isn't the best but it is there and audible especially in the video upon stopping. 

Exhaust/Rattle Noise when stopping (this noise is consistent while driving too)

 

It's normal. I have a 2021 TB with the 6.2. It makes the same sounds. I cut the stock muffler and flapper out and installed a straight through 3.5" muffler and I still hear it. It is the sounds of the DFM working. 

Put the truck in Manual shifting mode to M9 and try coming to a stop. By shifting in L9 you disable the DFM system. You won't hear that sound anymore.  My boys say the truck is farting when they hear it.

Edited by Firehawk99
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  • 3 months later...
  • 4 months later...
35 minutes ago, TNTSilverado said:

Put a Corsa Catback on it.....problem solved. The junk stock exhaust with the flappers are a joke. 

Someone mentioned they have an aftermarket exhaust and still have the noise. I’m a little confused now. Is this something with the exhaust manifold? Maybe direct injection noise? 

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I have had my Corsa on for almost 2 years and 30k miles. I don't have any issues with it. Maybe it is someone who just cut off the flappers or stock exhaust and welded in a straight pipe or another exhaust muffler. The Corsa Cat-back is very well constructed, sounds excellent, and straight forward to put on! I love it! 

Edited by TNTSilverado
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