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Thread: H-pipe placement for dual exhaust ??

  1. #1
    Join Date
    Dec 2006
    Location
    Oxford, Ohio 45056
    Posts
    175

    Default H-pipe placement for dual exhaust ??

    Flowmaster finally released their super 44 mufflers. I got two on the way.
    Exhaust will be installed within 2 weeks, then its time to fire the 502.

    Best place I see to put an H-pipe is behind transfercase on my truck,to keep it up high.

    Is this to far back from the motor to work properly ?

    Should I even bother using one ?

  2. #2
    Join Date
    Mar 2004
    Location
    northern Arizona
    Posts
    1,025

    Default

    My understanding is that an H pipe does 2 things: 1) helps equalize the pressure from side to side, and 2) increases lower end torque. I would think it would be fine there, if nothing else would equalize the pressure.

    Might cook the xfer case a bit though.

  3. #3
    Join Date
    Jan 2007
    Location
    Woodville, TX
    Posts
    26

    Default

    Better than nothing but you really want it as close to the motor as possible. Also I prefer an x pipe but that's opinion I guess

  4. #4
    Join Date
    Dec 2003
    Location
    Giddings, Texas
    Posts
    7,729

    Default

    Look at your fuel tank. Most people that run V8's either dump the exhaust under the corners of the cab on each side or bring the drivers side pipe over to the passenger side right behind the t-case. If you are running your pipes to the rear with the stock fuel tank installed, you will need to have the pipes next to each other from the rear of the cab all the way back. It should be real easy to put a 2 or 3" pipe between the two anywhere in there.

    I realize that for performance reasons you should place the H pipe at a specific place. Unless you make a U shaped pipe under the short shaft, you are really kind of limited on these trucks.
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  5. #5
    Join Date
    Jan 2007
    Location
    Fort Smith, Arkansas
    Posts
    911

    Default

    Not withstanding the limitations of your components, I've always thought the best place was indicated by where a crayon mark drawn horizontally along your pipes starts to melt-or stops melting if you think about it. I read up on this but don't remember all the details. You should be able to google it up.

  6. #6
    Join Date
    Dec 2006
    Location
    Oxford, Ohio 45056
    Posts
    175

    Default

    Quote Originally Posted by Barrman View Post
    Look at your fuel tank. Most people that run V8's either dump the exhaust under the corners of the cab on each side or bring the drivers side pipe over to the passenger side right behind the t-case. If you are running your pipes to the rear with the stock fuel tank installed, you will need to have the pipes next to each other from the rear of the cab all the way back. It should be real easy to put a 2 or 3" pipe between the two anywhere in there.

    I realize that for performance reasons you should place the H pipe at a specific place. Unless you make a U shaped pipe under the short shaft, you are really kind of limited on these trucks.

    I have put the gas tank in the bed. I have a large 4 1/2" hole just behind the rear fender , due to the fact my truck had a rear gas tank. I am thinking of cutting a hole on the other side and having the exhaust pipe exit there. I will machine some aluminum plates and have them anodized black to give the truck a cleaner look. This is the best way I have thought of eliminating the hole. It will also keep the pipes up high.

  7. #7
    Join Date
    Jan 2004
    Location
    Remote, North Dakota
    Posts
    144

    Default

    What is a Flowmaster Super 44? How is it different from, say, a regular 40 series?

  8. #8
    Join Date
    Dec 2006
    Location
    Oxford, Ohio 45056
    Posts
    175

    Default

    Quote Originally Posted by DNL View Post
    What is a Flowmaster Super 44? How is it different from, say, a regular 40 series?

    They are supposed to have a more aggressive sound, and are smaller in size for better fitment.

  9. #9

    Default

    By connecting the two sides of the exhaust system the scavenging efficiency is improved. An H-pipe works well for applications requiring torque-- it provides slightly more backpressure, whereas the X-pipe is more efficient at scavenging exhaust gases and therefore is better for horsepower and top end.
    Reviewing a 20 year old car craft mag-it appears the shape of an h pipe isnt really important (it could be a rectangle or sqaure if easier to fab up). An x pipe needs to be the same size as the rest of the exhaust or you'll effect flow.

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