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H&M/Harrop full exhaust

Discussion in 'VF Holden Commodore (2013 - 2017)' started by Jackel, Nov 6, 2019.

  1. Jackel

    Jackel Member

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    Hey guys! I have a Custom tune & vcm otr with the sound enhancer retrofitted on my vf ssv ls3.
    In the first week of December will be upgrading to a full harrop exhaust such as 200 cell high flow cats, 1 7/8 4-1 long tube headers and 2.5 inch cat back with bimodals.
    Im after more responsiveness and more torque all the way through the rev range inc bottom end.
    What concerns me is will there be too much noise coming into the cabin due to the sound enhancer still fitted? &
    will there be a fume smell too?
    Due to the upgrades cats and headers i have the concerns about increased cabin noise and fume smell.
     
  2. dimetime

    dimetime Active Member

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    Most people plug their sound enhancer with a OTR as you get enough sound from the intake, I'd just tell them to make sure it's plugged!
     
  3. 3rspecB

    3rspecB Well-Known Member

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    The sound enhancer works off your intake and is a closed unit I.e. no fume smell in the cabin. The sound coming out of the MSE may get louder and deeper after fitting the VCM OTR. Mine did after fitting Rotofab intake but I have now removed the MSE completely.
     
  4. Jackel

    Jackel Member

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    So considering i am upgrading to a full exhaust system wont there be more noise (louder) coming into the cabin through the sound enhancer? For instance the upgraded headers will be louder so im assuming all the extra noise will come through the MSE into the cabin or strictly just the slight induction noise from the OTR?
     
  5. 426Cuda

    426Cuda SUBLIME!

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    Just the louder induction noise through the MSE. Of course you'll have more exhaust noise too. But that's nothing to do with the MSE.
    I still have mine hooked up to my Roto-fab CAI. I really like the sound.
    Get it hooked up. If you don't like it, it's quick and easy to blank it off.
     
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  6. Jackel

    Jackel Member

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    I already have the MSE plumbed into the back of the VCM.
    Because its retrofitted my mechanic has said that if i want the MSE removed then i would need a new VCM cause it would be too dificult to plug the hole in the back of the VCM and can only plug the hole in the firewall.
     
  7. Jackel

    Jackel Member

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    Has anyone else had the H&M/Harrop exhaust done with headers & cats?
    Noticeable gains in both bottom end and midrange torque?
    What other improvements can i expect to see?
    Will be getting the retune too.
     
  8. 426Cuda

    426Cuda SUBLIME!

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    By "too difficult," maybe your mechanic means "I CBF"? Pretty simple I'd say TBH.
    You will get very noticible gains everywhere with those mods and a tune.
     
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  9. lmoengnr

    lmoengnr Well-Known Member

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    Yep! An alloy disc and some epoxy, all done...
     
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