X & H pipe vs straight dual exhaust

Mopar Exhaust Systems

  1. Tom Swope

    Tom Swope Well-Known Member

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    Maybe I can answer this first question.
    "I don't know how all these experts come up with some of this stuff??"

    Research, documentation and original low mileage examples.
    Parts books and actual tech/service manuals show (2) part numbers (left and right) for the head pipes. If equipped with an h-pipe there would have been (1) part number as with the hemi cars. When designing our 71 440 B exhaust systems we used a 16K mile 6 Barrel RR that we had access to locally. Also factory specification information was referenced as the base line for our production pipes which does call for a right and left exhaust pipe. We also manufacture an h-pipe for those that would like one but it may not be correct according to some. If you read the following attachment it explains some of what is said above. Individuals have claimed that some Canadian cars did have h-pipes installed but so far this cannot be substantiated by actual documentation. If anyone can add further documentation to the subject it would be great. As it has been said before "never say never with Mopar".
     

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  2. Tom Swope

    Tom Swope Well-Known Member

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    Here is some more documentation regarding 71 B 440 exhaust systems.
    Arvin Industries was a major O.E. supplier to Chrysler including assembly line
    exhaust parts. Here is what was supplied for U.S. built applications. Maybe there was a special order that was available for the h-pipe option.
     

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  3. abodyjoe

    abodyjoe Well-Known Member

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  4. abodyjoe

    abodyjoe Well-Known Member

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    my lil red came stock with a cross over. if i remember correctly the left and right were two different pieces and the "H" part clamped together..


    [​IMG]

     
  5. Lelo Dart

    Lelo Dart * FABO Gold Member

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  6. abodyjoe

    abodyjoe Well-Known Member

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  7. crackedback

    crackedback FABO Gold Member FABO Gold Member

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    Joe, you have a pic of your system from under the car. I swear I saved that one and can't find it.
     
  8. abodyjoe

    abodyjoe Well-Known Member

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    [​IMG]


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  9. abodyjoe

    abodyjoe Well-Known Member

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    these are the 2 1/2" tail pipes i had made after i put the street lynx in the car.. a lot of people say that 2 1/2 tail pipes after the mufflers will make more power because by then the exhaust gasses are cooler by then.


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  10. Locomotion

    Locomotion Well-Known Member

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    FWIW - just have to remember that it's not always easy to tell the difference just by "the seat of you pants", even at the track, one may need to change jetting a bit to get the most out of the change and a full system over an open exhaust can weight around 50-60 lbs more. So theoretically, in the 1/4 mile, that's about a half of a tenth difference. (i.e.: If it runs the same, you would actually be .05 faster at the same weight.)
     
  11. crackedback

    crackedback FABO Gold Member FABO Gold Member

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    Thanks
     
  12. abodyjoe

    abodyjoe Well-Known Member

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    you have a point with the weight thing. but i had cut outs so the weight was always the same..
     
  13. FJ5 Duster

    FJ5 Duster FABO Gold Member FABO Gold Member

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    Very Nice!
     
  14. greenweenie

    greenweenie Member

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    I'm kinda coming out of left field here, but instead of all this fancy crossover work.... wouldn't it be simpler, lighter, and easier just to run the pipes together with a Y and run a single from there back and accomplish the same thing?
     
  15. goldduster318

    goldduster318 Overzealous Car Modifier

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    The pipe would have to be HUGE. a single pipe would have to be 4.25" to have the same cross sectional area as dual 3". Hard to tuck that under the car. It likely doesn't have quite the same scavenging effect either.
     
  16. greenweenie

    greenweenie Member

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    Does the engine really need that much flow?
     
  17. desmo900

    desmo900 Well-Known Member

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  18. famous bob

    famous bob mopar misfit

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    these small engined cars are irrevellant to us big engine guys. I`ve already got 3.5" everything for my 505" wedge, going to use the 3.5 " inside spiral type inserts, ( 12" long) and 3.5" straight thru roundy-round short mufflers which don`t lower the decible rating much. but still haven`t made up my mind on an x, or h pipe. will have to dump in front of the rear wheels.(3/4" offset spring hangars and new full size tank) any thots on this? comments welcome??????bob
    P.S., had 3" spiral inserts dumping in front of the rear wheels on a 600 horse 406 sbc. couldn`t tell the diff. between them and flowmasters.
     
  19. famous bob

    famous bob mopar misfit

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    FORGOT, .003 diff. between the exhaust on that 406, and open headers. figured it was the weight differance!!-----bob
     
  20. 340 8BBL

    340 8BBL Well-Known Member

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    good read,but not apples to apples test.the h pipe system has chambered mufflers and the same pipe size front to back.the x uses "stepped"piping with 3.5 mid pipes and straight tru mufflers .a more accurate test would have been done with the same brand mufflers and system piping size for both tests.
     
  21. DartOS

    DartOS Well-Known Member

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    I can't vouch for the 15 more horses TTI claims, but with the TTI headers, Magnaflow X-pipe with Magnaflow mufflers I have, I got the sound I was looking for.
     

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  22. desmo900

    desmo900 Well-Known Member

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    It seems like the "X" cross over would act as a de facto driveshaft safety loop. Probably not ideal but better than nothing.
     
  23. jpikaart

    jpikaart Member

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    do you have a photo of how this system looks in the vehicle?
     
  24. ike61

    ike61 Well-Known Member

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    i don't know if this really matters, but all of the squad cars I've seen for the last five years have an Xpipe
     
  25. dans4door1970

    dans4door1970 Well-Known Member

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    Problem with x or h pipes is they can capture the tranny and other parts. They get in the way of removing the tranny
     
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