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Thread: 2015 5.3 horrible exhaust sound

  1. #1
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    2015 5.3 horrible exhaust sound

    So I ordered a Borla pro xs muffler for my 2015 silverado 5.3. I took it to my exhaust guy and he welded in my Borla and welded a piece of pipe in place of the resonator over the axle. Everything else is still stock including the valve after the muffler. Inside the truck it sounds great, until you roll the windows down! From outside the truck you can hear air "wooshing" over the sound of the exhaust. It sounds almost like a horrible exhaust leak. Does anyone know if this is something due to the mufflers straight through design, or what? What gmc sierra exhaust system you also recommened? I called borla and they said it's because of the AFM and I need to buy the cat back system. It does it all the time not just when in V4. Any info on how to get rid of this horrible sound is appreciated.
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  2. #2
    Quote Originally Posted by 87_Corolla View Post
    So I ordered a Borla pro xs muffler for my 2015 silverado 5.3. I took it to my exhaust guy and he welded in my Borla and welded a piece of pipe in place of the resonator over the axle. Everything else is still stock including the valve after the muffler. Inside the truck it sounds great, until you roll the windows down! From outside the truck you can hear air "wooshing" over the sound of the exhaust. It sounds almost like a horrible exhaust leak. Does anyone know if this is something due to the mufflers straight through design, or what? What gmc sierra exhaust system you also recommened? I called borla and they said it's because of the AFM and I need to buy the cat back system. It does it all the time not just when in V4. Any info on how to get rid of this horrible sound is appreciated.
    the whole exhaust taken out (left the cats alone) and replaced all of it with 3" pipe, a 14" magnaflow oval body and a 4" tip his sounds awesome, the valve and resonator are both gone on his no weird noises just an awesome deep throaty tone

    Perhaps your just hearing road noise? Maybe get that valve taken out

  3. #3
    Quote Originally Posted by richard777 View Post
    Quote Originally Posted by 87_Corolla View Post
    So I ordered a Borla pro xs muffler for my 2015 silverado 5.3. I took it to my exhaust guy and he welded in my Borla and welded a piece of pipe in place of the resonator over the axle. Everything else is still stock including the valve after the muffler. Inside the truck it sounds great, until you roll the windows down! From outside the truck you can hear air "wooshing" over the sound of the exhaust. It sounds almost like a horrible exhaust leak. Does anyone know if this is something due to the mufflers straight through design, or what? What gmc sierra exhaust system you also recommened? I called borla and they said it's because of the AFM and I need to buy the cat back system. It does it all the time not just when in V4. Any info on how to get rid of this horrible sound is appreciated.
    the whole exhaust took out (left the cats alone) and replaced all of it with a 3" pipe, a 14" Magnaflow oval body, and a 4" tip his sounds awesome, the valve and resonator are both gone on his no weird noises just an awesome deep throaty tone best exhaust for 5.3 Silverado

    Perhaps you just heard road noise? Maybe get that valve taken out
    no response.

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