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Need Help regarding X pipe's

This is a discussion on Need Help regarding X pipe's within the External Engine forums, part of the LSx Technical Help Section category; Hi, Say I have a 03 Z06 corvette and I am doing the exhaust and was planning on going with ...

  1. #1
    Member vette0009's Avatar
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    Need Help regarding X pipe's

    Hi, Say I have a 03 Z06 corvette and I am doing the exhaust and was
    planning on going with a 1 7/8" pair of headers chuck the cats and H pype and run her straight on to my B&B Bullets and then out the back
    Question: Why do I need an X pype I mean chevrolet did not put one on when they built the car Right ? They ran an H pype,
    I mean if you ran a & in your garden hose your not going to get more pressure, you'll get less so What am I missing here ?
    Are X pypes just a way to Boost manufactures Bottom line $$$$$$
    Or are they truely an essential part of today's modern exhaust systems.

    As a side note: can someone tell me where to find info regarding Cat Simulators ?

    Hey InAdvance, Thanks for all you guys help these past few month's
    LS1.Com is Top Tier In my Book

    Bon

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    Member Siciliano15's Avatar
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    Quote Originally Posted by vette0009 View Post
    Hi, Say I have a 03 Z06 corvette and I am doing the exhaust and was
    planning on going with a 1 7/8" pair of headers chuck the cats and H pype and run her straight on to my B&B Bullets and then out the back
    Question: Why do I need an X pype I mean chevrolet did not put one on when they built the car Right ? They ran an H pype,
    I mean if you ran a & in your garden hose your not going to get more pressure, you'll get less so What am I missing here ?
    Are X pypes just a way to Boost manufactures Bottom line $$$$$$
    Or are they truely an essential part of today's modern exhaust systems.

    As a side note: can someone tell me where to find info regarding Cat Simulators ?

    Hey InAdvance, Thanks for all you guys help these past few month's
    LS1.Com is Top Tier In my Book

    Bon
    x-pipes give a smoother transition and help scavenge the exhaust gasses out of the engine. h-pipes are probably the worst design for high rpm power because they create a turbulance at the H that doesnt exist on a car with no merge at all or on cars with x-pipes and y-pipes.

  3. #3
    Member vette0009's Avatar
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    Need Help regarding X pipe's

    Thanks for your response

    I am seeking to Educate myself better before I buy a set of longtubes and mid pipe system

    So far I'm leaning toward american racing 1 7/8 but I may still go with Lg motorsports 1 3/4" though I'd rather have the 1 7/8 which they do not make
    Bon

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    Member c5z28's Avatar
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    yup x pipe scavenges better and evens exhaust pressure. o2 sensors suck get the car tuned w/o the rear sensors.

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    formally 01 T/A 0verkill's Avatar
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    take a look at texas-speeds set up for your car
    http://texas-speed.com/shop/item.asp...d=689&catid=45
    and get it tuned after so you dont need the 02 sim's they suck any way

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    Member Siciliano15's Avatar
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    Quote Originally Posted by vette0009 View Post
    Thanks for your response

    I am seeking to Educate myself better before I buy a set of longtubes and mid pipe system

    So far I'm leaning toward american racing 1 7/8 but I may still go with Lg motorsports 1 3/4" though I'd rather have the 1 7/8 which they do not make
    Bon
    u only need 1 7/8" if u r gonna be doing heavy mods like race heads/cam. 1 3/4" is fine for boltons cars and mild stuff like ls6 heads/cam.

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    Member vette0009's Avatar
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    Need Help regarding X pipe's

    Quote Originally Posted by Siciliano15 View Post
    u only need 1 7/8" if u r gonna be doing heavy mods like race heads/cam. 1 3/4" is fine for boltons cars and mild stuff like ls6 heads/cam.

    Yeah I just got the car paid off last month
    So now I am beginning the mod process
    I plan on doing tf heads cam, headers, and going 11:1 compression my varaRam arrives on thursday, I put on a set of B&B Bullets on Sunday and now I'm researching headers,
    So far I like the American racing 1 7/8's off road set up but I need an air fitting for smog thus I may have to buy the catted versions which I'm not crazy about because I plan to run without cats and was considering passing up the whole X-pipe Snafu.
    future plans also include losing 200lbs off the chassis,
    I am Hoping to be in the 2900lb range

    Hey Thanks for your response !
    All the Best and Leave the Rest
    So. Cal Bon

  8. #8
    formally 01 T/A 0verkill's Avatar
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    Quote Originally Posted by Siciliano15 View Post
    u only need 1 7/8" if u r gonna be doing heavy mods like race heads/cam. 1 3/4" is fine for boltons cars and mild stuff like ls6 heads/cam.
    not try the 1 7/8 can help out a stock motor as well
    "The Camaro SS looks like it could kick your ass. The Trans Am WS6 looks like its on its way over to do it."

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    Quote Originally Posted by 01 T/A View Post
    not try the 1 7/8 can help out a stock motor as well
    ehhh to large of exhaust will hurt exhaust velocity and scavenging..you wouldn't see near the gains you would on a stock 346 as with 1 3/4s

  11. #11
    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by vette0009 View Post
    Yeah I just got the car paid off last month
    So now I am beginning the mod process
    I plan on doing tf heads cam, headers, and going 11:1 compression my varaRam arrives on thursday, I put on a set of B&B Bullets on Sunday and now I'm researching headers,
    So far I like the American racing 1 7/8's off road set up but I need an air fitting for smog thus I may have to buy the catted versions which I'm not crazy about because I plan to run without cats and was considering passing up the whole X-pipe Snafu.
    future plans also include losing 200lbs off the chassis,
    I am Hoping to be in the 2900lb range

    Hey Thanks for your response !
    All the Best and Leave the Rest
    So. Cal Bon
    i still think 1 7/8s are pushing it for a 346 with head and cam ..depending on your cam specs etc..if you are going FI or bigger cubes in the 400+ maybe even a 383 then bigger headers are a must.

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    formally 01 T/A 0verkill's Avatar
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    they are good on a ls car mabe not on a older motor like a gen 1 or 2 here is dyno
    http://www.ls1tech.com/forums/genera...o-results.html

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by 01 T/A View Post
    not try the 1 7/8 can help out a stock motor as well
    This is true. There have been several dyno's where the 1 7/8 headers improved accross the board on a stock LS1. Not just from individuals on a message board but also several magazine tests.
    These motors like the larger headers. Most go with 1 3/4 due to cost reasons, or just not knowing. But for best performance the 1 7/8 headers are the way to go.
    Last edited by Firebirdjones; 10-21-2009 at 09:56 AM.

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    I have 1 and 7/8 inch headers on my '06 GTO but I am planning a head and cam swap here soon. If there was a loss of power at lower RPM's, I never felt it. Not sure if I am going that route with my Trans Am, the Goat is sucking up all of the mod money!

    Scott

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by 01 T/A View Post
    they are good on a ls car mabe not on a older motor like a gen 1 or 2 here is dyno
    http://www.ls1tech.com/forums/genera...o-results.html
    read the entire thread..the compared a brand new high quality designed 1 7/8s to the decade old pacesetters designed 1 3/4s on a fasted 346

    and with only 5 rwhp and 3ft/lbs of gain i'll argue that with a newer designed high quality 1 3/4 header design..you will see no gain if not a higher output from the 1 3/4s. instead of the pacesetters ..do a QTP 1 3/4 and it would be a different story.
    pacesetters


    qtp


    so its not a fair comparison to test two headers on opposite spectrum

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by NavyTATwo View Post
    I have 1 and 7/8 inch headers on my '06 GTO but I am planning a head and cam swap here soon. If there was a loss of power at lower RPM's, I never felt it. Not sure if I am going that route with my Trans Am, the Goat is sucking up all of the mod money!

    Scott
    not saying you wouldn't gain anything ..but did you have 1 3/4s on before the 1 7/8s ?

  17. #17
    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    This is true. There have been several dyno's where the 1 7/8 headers improved accross the board on a stock LS1. Not just from individuals on a message board but also several magazine tests.
    These motors like the larger headers. Most go with 1 3/4 due to cost reasons, or just not knowing. But for best performance the 1 7/8 headers are the way to go.
    you've seen 1 7/8s outperform 1 3/4s on a stock motor in mags etc ? i have personally never seen any article regarding this so you could be right.

    but i will have to respectively disagree with you on this subject since i have heard countless times not to go 1 7/8s for a stock to even a higher built 346 ..N/A that is....i take headers like i do with most everything ..two much of a good thing can be bad....over cam'n, over header'n, and getting caught up in number games.

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by shady milkman View Post
    you've seen 1 7/8s outperform 1 3/4s on a stock motor in mags etc ? i have personally never seen any article regarding this so you could be right.

    but i will have to respectively disagree with you on this subject since i have heard countless times not to go 1 7/8s for a stock to even a higher built 346 ..N/A that is....i take headers like i do with most everything ..two much of a good thing can be bad....over cam'n, over header'n, and getting caught up in number games.
    Ya, magazines tested this stuff years ago. It's not a new concept.

    Although I agree the 1 7/8 headers were considered too big on first and second gen small blocks for anything other than extremely serious stuff,,,,that's just not the case with the LS engines. They are a completely different animal with their 15 degree heads etc.....and it's been shown even with a stock cam, heads, they want the bigger headers. Once heavier modifications are made to the engine the 1 7/8 headers will continue to outshine the 1 3/4 at an even larger margin.

    You have heard countless times to go for 1 3/4's because people are still of the old thought process and haven't seen or heard otherwise. These engines are still in there infancy and new to alot of people.

    Not a big deal, but if you are going for every bit you can find, for even a bolt on car,,,,the 1 7/8's are the ticket.
    Last edited by Firebirdjones; 10-21-2009 at 04:02 PM.

  19. #19
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by shady milkman View Post
    read the entire thread..the compared a brand new high quality designed 1 7/8s to the decade old pacesetters designed 1 3/4s on a fasted 346

    and with only 5 rwhp and 3ft/lbs of gain i'll argue that with a newer designed high quality 1 3/4 header design..you will see no gain if not a higher output from the 1 3/4s. instead of the pacesetters ..do a QTP 1 3/4 and it would be a different story.
    pacesetters
    Click for full size

    qtp
    Click for full size

    so its not a fair comparison to test two headers on opposite spectrum
    I'd say it's about as fair as you are going to get considering the 1 7/8 headers are only made by a couple of manufactures. Even using a newer brand 1 3/4 header of different quality,,,you are still talking 1 3/4 tube size. With everything else being equal to make the comparison as fair as possible and satisfy the naysayers,,,,the 1 7/8 header is still going to shine.

  20. #20
    Member vette0009's Avatar
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    Need Help regarding X pipe's

    All Very Good Response's

    All have some Valid points

    I am seriously considering 1 7/8" for the simple fact that I won't have to re-buy headers should I decide to drop in a larger displacement motor,

    At the same time I've read that the LS series Motors like a little back pressure,

    Though I have no personal experience to back that up.

    Say does anyone know if american racing's headers are stepped or flaired ?
    or are they 1 7/8 all the way through

    Thanks !
    Bon en So. Cal


    I am going to read this article http://www.superchevy.com/technical/...xh/index1.html

    That someone posted earlier

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