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340 headers VF2

Discussion in 'VF Holden Commodore (2013 - 2017)' started by Nico36, Mar 8, 2018.

  1. Nico36

    Nico36 Member

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    Hey guys, read all the threads on this however just had one quick question. Im about to get 340 headers installed on my VF2 SSVR, can I retain my factory cats or do I require HSV ones to go with the headers? Cheers
     
  2. lmoengnr

    lmoengnr Well-Known Member

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    Probably need the HSV cats.
     
  3. 426Cuda

    426Cuda SUBLIME!

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    I'd use the 340 HSV cats, if you can get them.
     
  4. dessy

    dessy Member

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    I have the HSV 340 headers and cats fitted but when I had them side by side it looked like the VFII cats would work. I think internally the holden and HSV cats are the same? Both 400 cpi? I would be keen for some bolt on high flow cats in the stock position but they seem to start at about $800 and getting them custom made is about the same.
     
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  5. Nico36

    Nico36 Member

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    Cheers boys, pretty excited to see how they turn out! I am also getting the GTSR 2.5" cat back put in too.
     
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  6. monstar

    monstar Naturally as-pirated

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    I’d make it work with VFII cats and a short piece of 2.25” (or 2.5”) mandrel as downpipe from header flange to cat inlet. Keep Euro 5 gear, less likely need for tune, should perform well, tunable downpipe.
    Someone did this recently, think @Mike__
     
    Last edited: Mar 8, 2018
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  7. MY17DIR

    MY17DIR Active Member

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    Let us know how you go.
     
  8. Mike__

    Mike__ Active Member

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    I fitted pacemaker 5387's and had them linked too a gts 2.5" cat back.

    Cost for pipework / magnaflow 200cell 30deg angled cats $800. Similar sort of work if you do This with the 340 headers. Then you'll need a tune.
     

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  9. monstar

    monstar Naturally as-pirated

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    Wow that looks so good ;)
    Wrong mike thanks anyway :)
     
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  10. monstar

    monstar Naturally as-pirated

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    Found it, here is the current thread about ADR legal HSV for VFII.
     
  11. MY17DIR

    MY17DIR Active Member

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    Looks like some quality workmanship there, nice job.
     
  12. Mike__

    Mike__ Active Member

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    Cheers mate

    Custom pipework by prestige exhausts in Malaga (Perth)
     
  13. monstar

    monstar Naturally as-pirated

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    Looks vaguely familiar:)
    Mainly different collector -> longer and mandrel megaphone 46ci, and cat position -> after the trans mount.
    What do you mean 30° angled cats?
    Did you specify the dimensions or let shop fit it best?
     
  14. LS1SS

    LS1SS Active Member

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    Wished we had some one in Sydney that would take the time to do that neat a job,every one I speak to aren’t interested to do stuff like that or find it to hard,probably beyond their skills,I wanted very similar to what Mike_ has but no one would listen to me so I will probably just go Hurricane 4-1s to same the time.
     
  15. monstar

    monstar Naturally as-pirated

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    The bloke who runs Sureflo over there has a really good technical knowledge and does both off-the-shelf and custom work.
    I recommend Pipemax software to understand and plan the exercise so you know what you want as opposed to having an exhaust shop "fit" some components in. I learned quite a bit by spending quite a lot, perhaps worth reading these few posts if you are interested in performance tuning the engine.
     
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  16. PeteSS

    PeteSS Active Member

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    Liverpool Exhaust do a fair bit of custom work, so I'm surprised they won't come to the party
     
  17. LS1SS

    LS1SS Active Member

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    Thanks for the info Monstar,these few posts were very good reading I some how missed those posts,full of good info.
     
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  18. Mavericks Choice

    Mavericks Choice Well-Known Member

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    Yes Steve is great with all things LS, one of the few who has a dyno for before & after results.
     
  19. Mike__

    Mike__ Active Member

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    Yeh I seem to recall that photo posted
    by someone who keeps preaching the 5387 + pipe combo on here. verified by my cousins hubbie who also uses pipemax software for his sports sedan exhaust setup and told me to use the Pacey 5387's a while back.

    There wasn't much science in my approach, it's the family hauler not a race car but may aswell try get it close to what theory suggests whilst still being practical. Don't plan on doing this exercise a 2nd time.

    I specified to Dominic over the phone beforehand what I wanted done for a ball park cost. He's familiar with the cars and the gts 2.5" mid section. I had a rough idea of measurements before fitting the headers over the weekend and seeing him on the Monday.

    With the car up on the hoist @ the prestige workshop a ~200mm collector seemed like it would work with a 8" cat following the original exhaust path Whilst retaining the oem / gts 2.5" hanger points and exhaust route path. The result what they came up with was what I had visualised and but not sure how it would be executed. Your pipe work has the hangers on the opposite side and looks to follow a new path.

    Dom used magnaflow 3" 200cell cats with a 30deg entry angle. He had a choice of straight or 30deg entry angle . I googled and only came up with straight entry so I'm not sure if maybe the small entry was cut on an angle before install?

    I took 2 small clips I still need to upload if anyone is interested. Nothing special but sounds fine to me

    Mike
     
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  20. Mike__

    Mike__ Active Member

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    These guys do a lot of hot rod work and did all the pipework on a family members chev belair? He commonly uses the same setup Naaf recommends on these cars. I'll agree not many exhaust shops do work like this. I had a local business make an absolute mess out of a simple job installing my gts mid section. Photos on here somewhere from last year.
     

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