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borla exhaust switch to slp muffler?

This is a discussion on borla exhaust switch to slp muffler? within the External Engine forums, part of the LSx Technical Help Section category; I have the borla cat back exhaust system and its not loud enough if i wanted to make it louder ...

  1. #1
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    borla exhaust switch to slp muffler?

    I have the borla cat back exhaust system and its not loud enough if i wanted to make it louder would i have to buy a whole new exhaust system or muffler because i want to buy a slp muffler

  2. #2
    None Shall Pass Knight's Avatar
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    Why not look into installing a cutout? I don't think the SLP will be any louder. Do you have l/t headers and a catless y-pipe? That will increase sound as well. A cutout provides a good option if you want quieter when driving, but louder at your discretion.

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    Member 02SS35th's Avatar
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    Loudness goes as follows:

    Long Tube Headers with True Dual setup
    Long Tube Headers with ORY
    1) Open Headers (definitely not recommended)
    2) Cut-Out
    3) Straight Pipes
    4) Resonator (SLP Loudmouth I or equivalent)
    5) Bullet Muffler
    6) Cat-back mufflers (depending on how much the sound is really muffled)

    I'm assuming you have the sound plate set to the last setting or completely open? Borla shouldn't be "quiet" with that sound plate open. Stock manifolds and cats will keep any system quiet for the most part. Need more info on your current setup.
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    Member Camaro69Mac's Avatar
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    Its not loud enough? haha i dont hear that often with my Borla. I had stock manifolds before and it was pretty loud with the open plate....then i put LT headers and no cats. Do that before you put an SLP waste of money on there!! Trust me Borla adjustable is my fav imo how can you go wrong. When you want it quiet 3 bolts and its almost stock then you open it up and sounds like an animal!!!!!

  5. #5
    Member bobbyd's Avatar
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    Quote Originally Posted by Camaro69Mac View Post
    Its not loud enough? haha i dont hear that often with my Borla. I had stock manifolds before and it was pretty loud with the open plate....then i put LT headers and no cats. Do that before you put an SLP waste of money on there!! Trust me Borla adjustable is my fav imo how can you go wrong. When you want it quiet 3 bolts and its almost stock then you open it up and sounds like an animal!!!!!
    I agree. but better yet get a cutout in the location of the plates.

    i love the way it sounds its loud. the other day i went and got a cutout install on the i-pipe just to be louder. it was already loud trust me setting peoples alarms and getting people scared when i would turn it on lol

  6. #6
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    the guy i bought the camaro off of doesnt have the adjustable plate one he has the regular cat back exhaust and in missouri i dont think a cutout would pass emissions

  7. #7
    Quote Originally Posted by 02SS35th View Post
    Loudness goes as follows:

    Long Tube Headers with True Dual setup
    Long Tube Headers with ORY
    1) Open Headers (definitely not recommended)
    2) Cut-Out
    3) Straight Pipes
    4) Resonator (SLP Loudmouth I or equivalent)
    5) Bullet Muffler
    6) Cat-back mufflers (depending on how much the sound is really muffled)

    I'm assuming you have the sound plate set to the last setting or completely open? Borla shouldn't be "quiet" with that sound plate open. Stock manifolds and cats will keep any system quiet for the most part. Need more info on your current setup.
    I think the lm1 is louder than a cut out because its not being dumped under the car. Its def a close comparision though.

  8. #8
    Member 02SS35th's Avatar
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    Quote Originally Posted by Mike0202 View Post
    I think the lm1 is louder than a cut out because its not being dumped under the car. Its def a close comparision though.
    Technically, yes this is true, especially if you're the bystander listening. Cut-outs are insanely loud for interior resonance, but the sound coming from below shouldn't make it much quieter bouncing off the street/car body versus out of the pipes into the open.

    I had a cut-out in the past on my LT-1 formula, stock manifolds, and it only seemed loud from the side it was on. After my car had driven by, it didn't seem so loud in comparison with an exhaust through a cat-back. Inside was insane though. I didn't have an electric cut-out so I didn't like it, especially when inspection time was coming up.

  9. #9
    Member nichoLaS1's Avatar
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    I will trade you my SLP for your borla

    2001 WS6 | Sunset Orange Metallic | M6 | SLP Lid | SLP Loudmoth | Koni 4/3 | Strano Springs
    UMI Subframe Connectors | UMI On-Car Adjustable PHB | UMI Short Stick | 5000k HIDs | much much more to come...

  10. #10
    Senior Member INMY01TA's Avatar
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    Quote Originally Posted by Mike0202 View Post
    I think the lm1 is louder than a cut out because its not being dumped under the car. Its def a close comparision though.
    Cutout under the car is louder, closer to the engine.

  11. #11
    Quote Originally Posted by INMY01TA View Post
    Cutout under the car is louder, closer to the engine.
    Im not sure. I guess in the end the sound is just too close.

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