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After-market Bi-Modal exhaust options

Discussion in 'VF Holden Commodore (2013 - 2017)' started by Ralph, Oct 11, 2015.

  1. Ralph

    Ralph New Member

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    This forum has been a great source of reading... must have spent half my Sunday here reading up on all things VF.

    I am looking to make my SSV sound a bit more like a V8 (and thanks for all the advice there, convinced me to jump on a VF1 and bolt on an exhaust).

    When it comes to mechanical things; i dont know a whole lot other then reading and researching the **** out of it online.

    What's important to me is that the car isn't over the top loud (and that is hugely subjective appreciate it). I don't want to be getting issues from the Po Po, at the same time i want my car to have a nice deep note.

    I am not that phased about it providing adding performance. What does a VF SSV do, 0-100 in 5.5? 5.1? seconds... fast enough for me.... i just want to hear how it gets there. So maybe just cat back system? (or should i be thinking something else - remember i am a dummy with this stuff). I also dont want to void any warranties

    I definitely do not want any droning or annoying noises on highway driving if the AFM kicks in, i do do a bit of driving (or my kid tells me its 'too noisey'... he puts ear muffs on when i start my Triumph Thunderbird up so dont need him wanting wear them in the car!). From the research the electric bi modal options seem to suit me best. So i can turn i can effectively turn the noise on or off (back to how it sounds out of the showroom - is that correct?).

    Looking at the Bi Modal options... i have found the following:

    - xForce which i saw on a Tekno demo video... seemed the business.... but they do seem costly.

    - Harrop Exhausts - that look the business, says they are bi modal but couldn't seem to see much about that (is it more mechnical, it kicks in a certain RPMs?)

    - there is the walkingshaw / delphinos but wasnt sure they were bi modal?

    - Are there other brands that do the ? I honestly have been googling and searching the website, but havent seen that many other options

    I've read about the Marriage Savers reducing drone (is the a video of what this drone is?) and potentially Manta exhausts, that reduce the drone, but i really want the flexibility of being quiet if i am getting home late... or if the neighbour has a stupid f**k off party on a school night, i can rocket it up at 5.30am to wake them up!

    As always... thanks for the insights and helpful tips! Happy to do the research, just looking for brands to look into.

    Ralph
     
  2. SnowDoggyDogg

    SnowDoggyDogg 2ltr? = Only milk & juice

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    The Rapid Exhaust (DG Pipes or Marriage Savers ) are never going to give you that stealth you're wanting. They crackle and burbble and are loud like a straight pipe exhaust. They sound like a V8 should, all the time.
    To be honest if you're wanting something that is only loud when you kick it but doesn't have drone (AFM or rpm drone @ ~1600 rpm-ish in 3rd gear) your best option might be to leave the stock mufflers on the end and go with extractors and high flow cats. Give it a boot full and your neighbors will know it's you or creep home at night and keep the kids asleep.
    Moving away from stock extractors and cats is never a bad thing for an LS engine but its not without its cost.
     
  3. sakatumi

    sakatumi New Member

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    I myself have been eyeing off the 2.5" Harrop cat back. I like you want a v8 sound and wouldn't mind a bit of performance gain. I watched a few videos on YouTube with the Harrop and it sounds pretty good, just worried about auto with AFM and if it would drone in the cabin much.
    I am don't think they are bimodal, at least the ones I was looking at $1980 for the cat back.
     
  4. Ralph

    Ralph New Member

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    Thanks for the reply. Only comment i'd add - its not just about when i kick it for the V8 Noise. i imagine i'd run the noise 80% of the time. I just want the flexibility to be make it stealth when i want .. which was why the xForce option seemed attractive (although seemed quite $$$$).

    This does sound the business.... https://www.youtube.com/watch?v=xA22K1c-UxM
     
    Last edited by a moderator: Oct 12, 2015
  5. sakatumi

    sakatumi New Member

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    That does sound pretty good. Probably a good option for you given you have kids and can just turn it off with the flick of a switch, especially that you would drive with it open most of the time. The price seems not too bad given its 3" and varex. I called Harrop and its $2200 installed for the 2.5" cat back.

    I am looking for something that's almost standard normal driving but with a bit of a deeper sound and opens up when you give it a bit. Sort of like an AMG C63, quiet unless you give it a bit of throttle but if you don't you can still hear it's a V8 when it takes off.
    Anyone know if the Harrop 2.5" is what I'm after? I haven't heard one in real life.
     
  6. VF Redline

    VF Redline Active Member

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    I've got the Xforce 2 1/2" SS catback with the Varex bimodals, I had them installed with a otr cai by walkinshaw and a 98 dyno tune, cost just over 3 but it's well worth it.
    I must say it has developed a slight drone, certainly not annoying I can live with it, around the 1600 to 1900 rpms maybe, just change gear or push the loud pedal harder it goes away, it doesn't do it in stealth mode. It was done a few months now and I love the sound it makes.
     
  7. Ralph

    Ralph New Member

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    should i go with Stainless Steel or mild steel? Stainless steel has a 5 year warranty vs 1 year of mild steel. about $350 difference. the varex muffler bit is stainless, so its just the rest to the cat back that i need to decide on.
     
  8. VF Redline

    VF Redline Active Member

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    I went with the Stainless as it will be good for 10 years or more, I didn't want to have to replace the exhaust in another 5 years or so, it will be many more $ to replace it then.
     
  9. arronm

    arronm Active Member

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    Go stainless
     
  10. Why?

    Why? New Member

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    I have the Harrop 2.5 inch and am in Melbourne if you want to hear it in the flesh. In Brunswick if that helps.
     
  11. vk2him

    vk2him Member

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    Does the Harrop have any AFM drone?
     
  12. Smashfist

    Smashfist Active Member

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    Pretty much everything will have some level of AFM drone. You're effectively running a 4cyl on twin 3" pipes and I don't know any 4cyl with huge pipes that sounds good.
     
  13. Romyn

    Romyn Member

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    I have the full Harrop 2.5 in system with headers and love the sound, nice and deep on low revs and is not to loud but stand on it and it's loud as f&@k
     
  14. Why?

    Why? New Member

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    My car is a manual
     
  15. sakatumi

    sakatumi New Member

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    I'm getting it installed at harrop this Friday. They recommend getting the AFM disabled, did you get yours disabled? I'm unsure if I should or not. I'm leaning towards getting it disabled. Thanks for the description, kind of what sound I hoping for, I'm just getting cat-back

    Thanks for your YouTube video too. It's what made me like the Harrop exhaust. Sounds really good.
    Edit: just saw your post on last page. Thanks for the offer. Already booked in to get it, I'm sure I will not be disappointed with the sound. Will probably see you on the road, I'm in Moonee Ponds.
     
    Last edited: Oct 24, 2015
  16. Why?

    Why? New Member

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    Moonee Ponds, I'm not even 400m from Moonee Ponds, Just the other side of the freeway. Staying away today though with the Cox Plate on.
     
  17. sakatumi

    sakatumi New Member

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    Ha! Surprised I haven't already seen your car around, always driving across the bridge to Brunswick, will keep an eye out for red a Harrop tuned SS.
    Yeah, been walking everywhere today to avoid. Lot of drunks going to be out tonight.
     
  18. Reaper

    Reaper Tells it like it is.

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    Why?

    When I had the E3 Senator I fitted a Pacemaker mild steel 2 1/2" cat back system keeping the OE bi-modal cans. As everybody who ever heard it in person will attest- it sounded great with stealth mode at the flick of a touch screen switch. With a SSV, I'd also add some extractors over the OE exhaust manifold. Add a quality OTR (not sure what the go is these days brand wise) and a tune (No reason to go mafless unless you get a big enough cam that the maf won't work) and you will have well mannered car which has some great poke when the mrs isn't around :p
     
  19. vk2him

    vk2him Member

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    How did they end up and how do they sound? How much did you pay? Thanks
     
  20. sakatumi

    sakatumi New Member

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    Ended up paying $2200, they did a good job and took their time and care to get it on. The sound is good. Sounds like a V8 now, I haven't heard it from the outside. Will get a mate to drive it for me when I get the chance.

    Sounds like thunder when you start it up, then calms down once everything is up to temp. At times sounds almost like stock when cruising , however there is a little bit of drone when the car is in a high gear and the revs are low and it is about to down gear (auto). Being a wagon there can be some resonance that lingers but it's definitely not too loud for a daily. I have had the AFM disabled as well, so can't say if 4 cylinder mode would drone but I would assume yes.

    Also it has gotten a bit more punch, gave it a bit of throttle like I normally would, but immediately copped some stink eye from my partner. Pushed her back in the seat a lot more than expected. I noticed it too but figured it was just the sound making it seem like it gained more power.
     
    Last edited: Nov 5, 2015

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