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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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  10. Jackel

    Jackel Member

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    Ok guys! Will call the mechanic tommorrow to book the car in next week for a full Harrop/H&M exhaust system.
    1 7/8 long tube headers.
    200 cell cats
    2.5 inch cat back with bimodals
    Retune.
    Cost will be around $4,000.
    If anybody thinks its not worth the money/not much performance increase/too loud etc now is the time to let me know or forever hold your peace.
    I currently have a custom tune and VCM otr only.
    Wanting it to sound better but not too loud & wanting more resposiveness with some more bottom end and midrange torque. I understand i wont get massive gains.
    Im hoping the bimodals will quieten down alot cause the mrs will kill me along with our new neighbours.
    Soooo! Go for it? Or reconsider?
     
  11. dimetime

    dimetime Active Member

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    $4k sounds right for that system and the tune, maybe on the cheap side, most high end zorst are around $4k so I'd say your getting the tune for free.
     
  12. markalan1two

    markalan1two Smile and wave boys !!!!

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    the mods you mentioned are the best bang for buck you will do to your car (power per dollar) with the exception of the headers which offer minor gains over a cat change with catback and tune.
     
  13. [paradox]

    [paradox] Active Member

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    when i got my exhaust the other week i was almost dead set on the harrop 3" bimodal. ended up changing my mind at the last minute.
    who knows if for the best.
    but the tuner did say the bimodals did quiet the harrop system down a fair amount.
    but also keep in mind the bimodals are open at idle, so unless you opt for a remote control and switch it to closed manually you are probably still going to upset your neighbours at a cold start.. at least you went the 2.5" so maybe not as much as i upset mine :cool:
     
  14. [paradox]

    [paradox] Active Member

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    also curious as why you have h&m in the title. dont they cease to exist?
     
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  15. abuch47

    abuch47 Active Member

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    the bimodals are only open at idle when selected as open. closed they are always closed.

    which system did you go and can we get a got damn video from anyone please?
     
  16. blackve76

    blackve76 Well-Known Member

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    If you already have tune otr won't be a big change, really with those mods gain from 3500rpm upwards.
     
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  17. Jackel

    Jackel Member

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    I was under the impression that Harrop uses/was using the H&M products in terms of exhausts.
     
  18. Jackel

    Jackel Member

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    Thats right but i would expect more responsiveness all the way through the rev range and a bit more torque in the lower rev range!
    Correct me if im wrong tho?
     
  19. Jackel

    Jackel Member

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    Will be going Harrop full system. 2.5 cat back
    1 7/8 headers
    200 cell cats.
    Mechanic is flat out till xmas so will be booked for mid jan.
     
  20. Jackel

    Jackel Member

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    Are the bimodals closed at idle during start up or open?
    Some say if set to off they are closed at start up idle while others say they are open at start up idle irrespective of whether set to off or on.
    Thoughts of going either 1 7/8 headers or 1 3/4 headers?
    Wont be camming or a blower.
    Dont want to lose any bottom end torque.
     

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