Results 1 to 16 of 16

Manifolds vs. Headers

This is a discussion on Manifolds vs. Headers within the External Engine forums, part of the LSx Technical Help Section category; How much power would I be losing if I were to put a decent cam in my car and some ...

  1. #1
    2001 ws6 6-speed david_viny's Avatar
    Join Date
    Jun 2008
    Location
    Maine
    Posts
    177

    Red
    2001 Pontiac Trans Am WS6

    Manifolds vs. Headers

    How much power would I be losing if I were to put a decent cam in my car and some bolt on’s with my stock exhaust manifolds and cats? If it’s like 10-15 hp I could maybe deal with it but if it’s something like 30+ I might just have to do it lol.

    Also didnt the 2001-02 factory manifolds have a slightly better design then previous years?

    Anyone else running a fairly big cam with stock manifolds and cats care to share their power #’s?

    Thanks,
    -Dave
    Last edited by david_viny; 09-28-2008 at 12:05 PM.

  2. #2
    Member WS6ICK2K's Avatar
    Join Date
    Jan 2008
    Location
    Pittsboro NC
    Posts
    587

    Metallic Blue
    2000 Trans Am WS6

    The 2001 - 2002 cam with a factory LS6 style intake. It bumped up the hp up about 10.

    IMO I would def do LT headers with a cam. The headers really help out the cam plus it sounds so much better. Lts are one of the best bolt ons to do.

  3. #3
    Member Bouvers's Avatar
    Join Date
    May 2006
    Location
    Canada
    Age
    31
    Posts
    857

    Blue 1997 Trans Am(Sold)
    Pewter 2001 Trans Am Vert

    I don't know if you're doing heads or not with your cam but if you are don't even think of doing that without doing LT's...

    if you're doing cam only I still dont see the use of doing without doing LT's you can get a good pair of LT for the price of your cam... consider as just part of "must do's" for a cam, such as springs, retainers and what not.

    EDIT: yes the 01-02 came with the LS6 however, the initial post was inquiring about exhaust manifolds, in which case yes in 01-02 the LS1's did receive slightly better flowing exhaust manifolds but not nearly significant enough to make up for LT's...

  4. #4
    Veteran Hi-Po's Avatar
    Join Date
    Nov 2005
    Location
    Florida
    Posts
    10,461

    Black
    1999 TA WS.6

    If you dont have the money for LT in your cam budget, dont buy a cam. LT's should be your first mod. Bar none IMO.

  5. #5
    formally 01 T/A 0verkill's Avatar
    Join Date
    Jul 2007
    Location
    San Diego ca
    Posts
    2,253

    "Arrest Me Red"
    2001 trans am

    i know that llt's are a good bolt on but i know you cant have them in some places. my wife and i may move to so-cal and i know you cant there so is a cam posabil with just manafolds?

  6. #6
    Slow'er'Ass Mr. Luos's Avatar
    Join Date
    Aug 2005
    Location
    Thornton, CO
    Posts
    23,785

    Red Tint Jewelcoat
    2008 Trailblazer SS

    There are cams out there designed to work well with the stock exhaust manifolds.
    You are leaving power on the table regardless though.

    If you get a basic off-the-shelf cam NOT designed for stock manifolds (cheater type cams, I think Thunder called theirs the CheaTR), you will be leaving at least 30 HP on the table with the stock manifolds.

  7. #7
    2001 ws6 6-speed david_viny's Avatar
    Join Date
    Jun 2008
    Location
    Maine
    Posts
    177

    Red
    2001 Pontiac Trans Am WS6

    Damn, looks like I should do Lt headers then when I do the cam.

    I'm not very close yet on what I want to do as far as cam, possible head porting or anything of that nature but right now an exhaust is def on the list as far as cat backs go. I was reaaaaally looking at the Bassani true dual but I think there headers are like mid length ones (almost not worth it) and would really not want to hack up that exhaust for Lt's. So I was going to get the Bassani that goes to the stock manifolds & cats if they flowed ok after the future mods. Just trying to think ahead, would rather do the exhaust just once.

    We have a visual inspection on a lift in Maine so it def has to have cats (at least for inspection ) but I’m not 100% if the Lt's would pass, even if there were cats.

    As far as the 01-02 manifolds I meant exhaust, should have clarified.

    I would still kind of like to see a dyno sheet though on how much power I would be down with factory manifolds and cats, but I guess no one keeps them after a cam change lol.

    So now I'm back to confused
    Last edited by david_viny; 09-28-2008 at 06:24 PM.

  8. #8
    Powerstrokin LT1 > LS1's Avatar
    Join Date
    Dec 2007
    Location
    Aurora IL
    Posts
    1,264

    Trans Am owner
    former

    just forget about the cam for now. you need supporting mods for that first.

    I vote longtubes. I just ordered a set for my car. check this place out!!!!!!!!!!!!


    www.lpparts.com

  9. #9
    Member Bouvers's Avatar
    Join Date
    May 2006
    Location
    Canada
    Age
    31
    Posts
    857

    Blue 1997 Trans Am(Sold)
    Pewter 2001 Trans Am Vert

    I'm sorry I know nothing of the laws so I'm sorry if this is a stupid question but just something worth mentioning you can get LT's with full EGR & AIR hook ups... or atleast I thought you could...

  10. #10
    formally 01 T/A 0verkill's Avatar
    Join Date
    Jul 2007
    Location
    San Diego ca
    Posts
    2,253

    "Arrest Me Red"
    2001 trans am

    Quote Originally Posted by Bouvers View Post
    I'm sorry I know nothing of the laws so I'm sorry if this is a stupid question but just something worth mentioning you can get LT's with full EGR & AIR hook ups... or atleast I thought you could...
    you can but in sum states like cali i know you have to have the cats in the stock lo-cal to pass

  11. #11
    Something Diabolical... chuckie669's Avatar
    Join Date
    May 2007
    Location
    Houston, Texas
    Posts
    2,677
    2000 C5 Torch Red

    Quote Originally Posted by LT1 > LS1 View Post
    just forget about the cam for now. you need supporting mods for that first.

    I vote longtubes. I just ordered a set for my car. check this place out!!!!!!!!!!!!


    www.lpparts.com
    Let me know how those look/ work out when you get them in and installed. Never heard of that place, but their prices are pretty good.

  12. #12
    Powerstrokin LT1 > LS1's Avatar
    Join Date
    Dec 2007
    Location
    Aurora IL
    Posts
    1,264

    Trans Am owner
    former

    hopefully will arrive tomorrow. I have heard absolutely NOTHING bad about em

  13. #13
    Member BlueMagicSS's Avatar
    Join Date
    Dec 2007
    Location
    Oakland, California
    Age
    29
    Posts
    295

    Candy Blue
    2000 Camaro SS

    Definitely get LT's before a cam... no question. LT's should be one of the first things you do next to the free mods (which I still have to do)

    LT's are a big no-no in California... BUT I have them with no cats.... oh well... there are ways to pass smog... so I mean hey... it's completely up to the owner... you MAY be able to find some shorty's that are legal, and if you seach HARD ENOUGH MAYBE some LT's too... my Edelbrocks came with a CARB sticker... so if I had cats I'd "technically" be legal...

    2000 Camaro SS, M6, Edelbrock LT's, Eibach Pro-Kit, Edelbrock Adjustable Coil-Overs
    1986 Camaro Iroc LS1 Swap In Progress

    Blue Magic...
    Like Pepsi It's A Brand Name...

  14. #14
    Senior Member INMY01TA's Avatar
    Join Date
    Jan 2006
    Location
    The great red state of MD.
    Posts
    5,755

    Black
    2001 Trans Am (sold)

    You'd prolly gain just as much by getting long tubes now as opposed to getting a cam w/out long tubes now.

  15. #15
    Member WS6ICK2K's Avatar
    Join Date
    Jan 2008
    Location
    Pittsboro NC
    Posts
    587

    Metallic Blue
    2000 Trans Am WS6

    Quote Originally Posted by INMY01TA View Post
    You'd prolly gain just as much by getting long tubes now as opposed to getting a cam w/out long tubes now.
    + 1

  16. #16
    Member
    Join Date
    May 2007
    Location
    Fredericksburg, VA
    Age
    31
    Posts
    151

    Black
    2001 T/A M6

    You can also get high flow cats if you need them for inspection. I don't have to worry about emissions (or inspections for that matter hehe) so I order all my stuff completely illegal PS LT's with ORY and Borla adjustable exaust, absolutely loooove the sound! however it is a bit loud. Basicly if I take the restrictor plate out of the tips of the borla its straight piped. I'm almost affraid of putting a cam in it now because it will be ridicuously loud. I won't be able to start it without waking ppl up lol

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Question: shorty headers vs stock manifolds
    By CAMSS2002 in forum External Engine
    Replies: 3
    Last Post: 05-26-2010, 11:40 AM
  2. LS6 Intake Manifolds vs. Headers
    By Danny84 in forum External Engine
    Replies: 14
    Last Post: 08-19-2007, 10:38 AM
  3. Headers or manifolds on a STS turbo car?
    By Alaska SS in forum Forced Induction
    Replies: 5
    Last Post: 05-22-2007, 04:32 PM
  4. FS: 2000 C5 Headers/manifolds
    By Silver Vert in forum Parts For Sale / Trade
    Replies: 0
    Last Post: 02-23-2006, 04:13 AM
  5. LS1 manifolds for turbo headers?
    By notchback in forum Forced Induction
    Replies: 13
    Last Post: 12-19-2005, 02:14 PM

Bookmarks

Posting Permissions

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