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HSV Headers

Discussion in 'VF Holden Commodore (2013 - 2017)' started by rwdv8, Feb 7, 2018.

  1. rwdv8

    rwdv8 New Member

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    Just a quick one, I need some help before I purchase these off a mate. Will VE E2 GTS (LS3) headers bolt straight up to a VFII Redline with the LS3? Also, will using HSV headers void my warranty?

    Planning to do the HSV Headers and Harrop or DiFilippo Catback.

    Sorry if this is a repost, I tried using the search but am only semi-literate with computers.
     
  2. monstar

    monstar Naturally as-pirated

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    Yes they fit, together with cats it won’t possibly void your warranty.
    Any other cats will trip the engine light which can easily be turned off, but that means altering the tune.
     
  3. rwdv8

    rwdv8 New Member

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    So,

    will they bolt up to the standard vfii cats/catback as he doesnt have the hsv cats (i dont know why or where they have gone). Thanks
     
  4. monstar

    monstar Naturally as-pirated

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    Oh I see. The HSV header and cat combo is abundant and cheap BTW even if you can’t find HSV cats on eBay.
    Otherwise the VFII headers and cats are different, I think the location of the catback flange is the same, so straight HSV headers and cats swap should work but not mixing HSV headers onto VFII cats. that’s because the inlet flange location / angle is different.
     
  5. LS1SS

    LS1SS Active Member

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    Just finished doing a HSV swap off VE HSV into VF2,very easy to do with no problems,pass side bolt header and cat together and jam in from under neath,dr side undo stearing rod from rack push it aside (is easy with wheels in straight ahead just undo bolt push rod up BUT don’t turn it) slip header up from under neath bolt up then bolt up cat one bolt under neath one from top with very long extension,dr side sensor front just undo from cat,pass side is same don’t bother unclipping from loom as it is difficult to do backs just undo loom from side of box, before you fit sensors twist them around half doz times then screw them,the real pain and will test your scanner throing skills is re fitting dip stick tube,real turd to do,easy trick to do/undo censors is get an OLD 7/8ths ring spanner and cut a slit in ring just wide enough to fit wires thru and use it to undo sensors,DONT use open enders as they will round off the hex,dip stick grrr,hope this helps.
     
  6. LS1SS

    LS1SS Active Member

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    Just to add to last post,if you do HSV headers n cats the headers have screw in hole for front sensor BUT you will have to get rear sensor bungs fitted to your after cat pipes as std cats have two sensor holes HSV cats have none or get rear sensors deleted thru tune.
     
  7. monstar

    monstar Naturally as-pirated

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    Great detail, thanks.
    I don’t get what you mean regarding the rear sensor, bung is located cat back, after the flange on VE and VF. HSV headers and cats are at the stock flange location.
    Check that rear sensor bung is just after the catback flange because maybe the catback you have is not Holden VE/VF?
     
  8. MY17DIR

    MY17DIR Active Member

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    What did you end up having to do to get the dipstick in? Did you use new header/manifold gaskets or re-use the existing ones?
     
  9. monstar

    monstar Naturally as-pirated

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    Sorry I just checked and yes, the rear sensor bungs are now behind the cat before the catback flange on the latest VF.
    0A01A025-027A-4C37-B605-2EDE399E5919.jpeg
    Actually the entry to cat is fixed! Doesn’t look that bad at all.

    BTW the catback and mufflers look great too, maybe mid muffler delete in favour of properly located h-pipe (crossover) would be a decent performance option and sound enhancer. Else copy difilipo and kiss at the third harmonic and run two full length hotdogs down to the square resonator near the crossmember.
    C7C4148E-FE82-468C-9AE7-A82BE540508B.jpeg

    The question remains whether HSV headers will bolt up to the revised cat, but looks entirely feasible to fabricate a connecting piece to flange up to the HSV headers.
    344F9EEB-C49A-469B-8FE8-B9BE8AA63201.jpeg
    There is another active thread with a guy doing just that.
    This way won’t void your warranty or throw a check engine light.
    If anyone would like to keep factory catback and install h-pipe in place of mid muffler PM me for exact specs.
     
    Last edited: Feb 9, 2018
  10. LS1SS

    LS1SS Active Member

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    To fit dip stick tube with HSV headers you need two people one up top and one under neath and a good small pipe bender,very fiddly as the starter and oil temp wiring gets in the way,lots of in out bend a bit n back in but perseverance it does work with final tap of hammer to seat O ring.These cats will bolt up to mid section with flat flange on mid pipes,to make HSV cats fit real well cut flange off cats at exit end remove small pipe that holds conical seal it goes about 1 1/2 inside cat and about 2 1/4 in dia then reweld cat flange and you now have 2 1/2 cat exit or you can expand cat out let n weld 3inch flange to keep it stock looking.
     
  11. monstar

    monstar Naturally as-pirated

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    I think most VFII people fitting HSV headers and cats want to keep the warranty though, hence the focus on keeping VFII cats and bung location. Because it won’t set off the check engine light.
    Rather working the front, flange after merge at end of primaries into cat inlet.
    Basically fabricating a better downpipe solves the tune issue whilst improving performance potential.
     
  12. LS1SS

    LS1SS Active Member

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    You are correct monster,that is the next thing I will work on,I think any one doing this mod if they can find flexible dip stick they will find it a lot easier,I don’t know where or what type to use that is compatible with these engines.
     
  13. 3rspecB

    3rspecB Well-Known Member

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    The oil dipstick was a pain too when I fitted HSV headers to my VF2 Redline. I had access to another VF2 LS3 to look at. This made it easier in the end to fit the disptick. We didn't bend the pipe, just had to go in at a different angle and all good.
     
  14. duaned

    duaned Active Member

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    Would it be safe to say those that are fitting HSV cats and HSV Headers are just wasting time and money if they propose not to get a tune to balance AFR's etc? With the extra exhaust flow, would this provide a more lean mixture resulting in less power?
     
  15. monstar

    monstar Naturally as-pirated

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    No need (requirement) to tune anything, but yes is probably better to describe the effort as maximising combustion and exhaust scavenging efficiency within the parameters of the standard tune.
    It will make a difference to performance and sound, I think worthwhile maintaining warranty compliance with zero risk / decent returns.
     
  16. Paulie81

    Paulie81 Active Member

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    so who says it will preserve factory warranty?
     
  17. monstar

    monstar Naturally as-pirated

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    By not altering the factory warranted tune settings. Like virginal chastity changing that whatsoever definitely voids the warranty.
     
  18. blackve76

    blackve76 Well-Known Member

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    Not have headers but I got a flexible stainless dipstick when I did my headers(Rex headers)
     
  19. LS1SS

    LS1SS Active Member

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    Blackve where or what make of dipstick did you use?
     
  20. franco

    franco New Member

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    So does any company make a set of headers for the VFII that will bolt on with no modifications using existing cats yet ???
     

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