Page 1 of 2 12 LastLast
Results 1 to 10 of 11

Thread: 4-Branch Outlet Manifolds, Worth The Cash??

  
  1. #1
    Status
    Offline
    After_Shock's Avatar
    AOC Fanatic
    Join Date
    Jun 2003
    Posts
    788
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)

    4-Branch Outlet Manifolds, Worth The Cash??

    Im considering a 4 branch outlet manifold for my Astra G 1.8, my dad says it will increase the noise from the exhaust and also help the performance, ultimately are they worth the £300 or so??

    Also anyone using one and if so who would people recommend to get one from, Dbilas, Lexmaul etc etc??

    Cheers.

  2. #2
    Status
    Offline
    Nrj's Avatar
    AOC Obsessed
    Join Date
    May 2003
    Posts
    4,807
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    They are a good mod and I want one but im not paying £300+ for one, try finding a specialist that will make one, that way it might be cheaper.
    Cant Think of Anything Funny To Say

  3. #3
    Status
    Offline
    After_Shock's Avatar
    AOC Fanatic
    Join Date
    Jun 2003
    Posts
    788
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    From the 4 branch manifolds that are available theirs a price difference of around £100, whats the difference materials? Surely they all have the same effect so the more expensive ones wont be worth it?

  4. #4
    Status
    Offline
    RICHIE's Avatar
    AOC Obsessed
    Join Date
    Jun 2003
    Posts
    1,708
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Different materials give a different note to your cars sound, but more practically the stainless steel versions will last a lifetime. Where as the mild steel pipes will break down.
    Cheers Rich.
    http://images.fotopic.net/?iid=yfn4l...x=400&oq=0
    North East Regional OrganiserClickHERE For The Regional Forum!

  5. #5
    Status
    Offline
    Steve's Avatar
    AOC Obsessed
    Join Date
    May 2003
    Posts
    5,062
    Mentioned in
    1 Post(s)
    Quoted
    0 Post(s)
    Tubular steel manifolds do make a lot of difference, but you should blow the bank and try and get stainless. The heat does tend to make the tubes crack on mild steel. I had a 4-2-1 on my Nova GTE, which was mild steel. It cracked, I welded it and plated it and it cracked elsewhere. In the end I had two manifolds, one off the car ready to fit when the other cracked .

    The other thing we found was that you could do with bracing the manifold further down, as they tend to be longer than the OEM system and stress when the engine shifts.

  6. #6
    Status
    Offline
    After_Shock's Avatar
    AOC Fanatic
    Join Date
    Jun 2003
    Posts
    788
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Steve thanks for the advice, I will probably go with a stainless one when I get around to it, do look alot better aswell!

    Also I noticed theirs a sensor plugged into the standard one, do replacement ones also allow the sensor to be plugged in?

    Has anyone done this mod on a G and if so do they need welding or just bolt on?

  7. #7
    Status
    Offline
    mark_dj's Avatar
    AOC Obsessed
    Join Date
    May 2003
    Posts
    4,728
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    If you get a good power gain I might buy a one.

  8. #8
    Status
    Offline
    Steve's Avatar
    AOC Obsessed
    Join Date
    May 2003
    Posts
    5,062
    Mentioned in
    1 Post(s)
    Quoted
    0 Post(s)
    The sensor is the Lambda sensor for the closed loop engine management. A good replacement exhaust should have the boss fitted to take the sensor, worthwhile checking though, as a lot of 'motorsport' systems don't have the bosses for any of the original sensors.

    It shouldn't be necessary to do any welding to fit the exhaust, but be wary that you will need to undo the bolts/nuts securing the manifold to the cylinder head and these can be prone to snapping. To remove the snapped studs can be a pain in the ar*e and a lot of garages will charge extra for this.

    If you can, replace all the studs when the manifold is off, as a tubular steel manfold (as opposed to cast iron or steel) will need replacing or resealing at some point in the future

  9. #9
    Status
    Offline
    After_Shock's Avatar
    AOC Fanatic
    Join Date
    Jun 2003
    Posts
    788
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    I will ask around see what sort of prices can get one, will probably put one on at the same time that do the cams.

    Do the high performance cambelts such as piper or kent ones do anything or are the standard ones just as good?

  10. #10
    Status
    Offline
    Steve's Avatar
    AOC Obsessed
    Join Date
    May 2003
    Posts
    5,062
    Mentioned in
    1 Post(s)
    Quoted
    0 Post(s)
    Quote Originally Posted by After_Shock
    I will ask around see what sort of prices can get one, will probably put one on at the same time that do the cams.

    Do the high performance cambelts such as piper or kent ones do anything or are the standard ones just as good?
    Piper and Kent cam belts come into the same category as their oil filters (total b*llocks). I had a stand up argument in Demon Tweeks with the Pipercross rep about their 'high performance oil filters'. Total shit, their kit is as good as top quality aftermarket, buy a BRANDED cam belt and it'll be as good (but 1/2 the price of a Kent or Piper) a cam belt.

    Oh, but you won't have smart logo on your cambelt, I believe the logo gives an extra 15 bhp

Page 1 of 2 12 LastLast

Similar Threads

  1. Dbilas inlet,outlet manifolds and cams
    By rovkid in forum Turbo Petrol Engines inc. Transmissions
    Replies: 1
    Last Post: 04-12-2008, 08:43

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •