Any point in using an X or H pipe?

Fuselage Years

  1. challenger

    challenger Member

    Messages:
    176
    Likes Received:
    32
    Joined:
    Jul 26, 2013
    Location:
    Hampstead, NC
    I changed the mufflers on my car but I am now looking at possibly changing a few other pipes as well. Is there a good reason to use an H or X pipe? When I stand behind the car when it is idling the new Dynomax mufflers sound nice BUT sound a little like a cabin cruiser with a V8. I wonder if an H pipe would make the exhaust sound smoother?
     
  2. Ironwolf

    Ironwolf Senior Member

    My Photo Garage
    Messages:
    3,281
    Likes Received:
    1,477
    Joined:
    Sep 25, 2013
    Location:
    Massachusetts

    I would guess it would depend on what and how much your smokin !!!! :rofl:
     
  3. 4spd300J

    4spd300J New Member

    Messages:
    27
    Likes Received:
    12
    Joined:
    Jun 7, 2017
    Location:
    Aztec, New Mexico
    I used the identical Dynomax mufflers on my Desoto 345 and Chrysler 413. I was able to use an X pipe on the Desoto but the floorboards on the Chrysler wouldn't allow it. I replicated the original H pipe on it. The Desoto sounds mellower and has much less resonation with the X pipe.
     
    • Like Like x 2
  4. tbm3fan

    tbm3fan Senior Member

    Messages:
    3,918
    Likes Received:
    984
    Joined:
    Jan 22, 2012
    Location:
    Pleasant Hill, CA
    When I went from single to dual exhaust on my Dodge with the Dynomax I had an H pipe put in as everything was new from manifolds to tailpipe.
     
  5. CBODY67

    CBODY67 Active Member

    Messages:
    443
    Likes Received:
    92
    Joined:
    Mar 27, 2011
    I believe the main reason for the H-pipe is probably more of a sound-tuning situation, but the stated reason was for the two sides to "share" flow capacity. Ford used H-pipes back in the 1960s on almost all of their dual exhausts.

    The X-pipe was a NASCAR innovation and "trick" that was revealed when a Grand National (series) car flipped during a race. THEN it caught the imagination of many people and was "on the radar" as an H-pipe replacement. On each exhaust pulse, it can be shared with either side of the system, so allegedly less flow restriction and greater power. How much greater in a stock system might be debatable.

    On an old website dedicated to the Ford "Panther" cars, there was a link to a drag strip video of a Lincoln with an X-pipe. There was a note that when two X-pipes were used on the same car, the sound became much more high-pitched at WOT and high rpms, I believe. Seems like the original purveyor of the X-pipe was "Dr. Exhaust"?

    Be sure to allow for some removal options should the driveshaft and/or u-joints need attention.

    CBODY67
     
    • Like Like x 2
    • Thanks! Thanks! x 1
  6. 65sporty

    65sporty Senior Member

    My Photo Garage
    Messages:
    3,572
    Likes Received:
    714
    Joined:
    Aug 24, 2013
    Location:
    Marlette,Mi
    Check this out, hope it helps with your decision.
     
    • Like Like x 4
    • Thanks! Thanks! x 1
  7. 70bigblockdodge

    70bigblockdodge Old Man with a Hat

    Messages:
    8,616
    Likes Received:
    2,927
    Joined:
    Jan 19, 2013
    Location:
    Avonmore Pa.
    H I would not waste time on unless you are bored and a welder handy. X pipe is obvious how it works better, better than open headers, probably not. It will sound a little different at high RPMs
     
  8. bluefury361

    bluefury361 Old Man with a Hat

    Messages:
    10,075
    Likes Received:
    5,154
    Joined:
    Mar 9, 2011
    Location:
    Alabama
    The X/H pipe will smooth out the cylinder pulses and provide a smoother flow and mellower sound. Performance will also benefit a little. Location is important. To determine the best place to locate the crossover, paint the exhaust pipes from the manifold back a few feet, run the engine and note where the paint no longer burns off the pipe.
     
    • Thanks! Thanks! x 3
    • Agree Agree x 1
  9. 330dTA

    330dTA Active Member

    Messages:
    492
    Likes Received:
    135
    Joined:
    Dec 23, 2014
    Location:
    Helsinki Finland
    1) Yes, you would gain HP and get quieter sound with an X-pipe, and
    2) No, you can't fit an X-pipe to a '69 300. The torsion bar cross member architecture prevents it. Plain and simple.

    The exhaust pipe holes in the crossmember are too far outboard on a C-body; they force the pipes too far apart exactly where the X-connection should be for it to have any effect. That is why TTI does not make them for our cars.

    On B and E-bodies the cross member is different, there it's possible to route the exhaust pipes next to the transmission pan, and put the X-connection immediately behind the tranny. If it's further back, where it would end up in a C-body, the gases would be cooler, robbing the X-pipe nearly all of its effect.
     
    Last edited: Aug 13, 2017
    • Like Like x 2
    • Thanks! Thanks! x 1
  10. cantflip

    cantflip Old Man with a Hat

    Messages:
    6,145
    Likes Received:
    2,114
    Joined:
    Nov 1, 2015
    Location:
    Orlando, FL
    That would be alot of useless work, but may change the sound enough for you to care. From inside the car, at speed, I would argue it wouldn't be enough to offset the effort involved.

    If you have too much $$$ in your pocket, go for it. Otherwise, the gains you may get won't be worth the cash. Even when tuning for sound, which is all you'd be doing.

    I like all of the replies to this.
     
    • Like Like x 1
    • Agree Agree x 1
  11. Yatzee

    Yatzee Active Member

    Messages:
    381
    Likes Received:
    142
    Joined:
    Aug 3, 2012
    Location:
    St Thomas, Ontario
    I was really surprised when I read the comments on this forum regarding exhaust resonance and never knew people addressed it this way. You need to read a page or two of the members entries to see how far out this idea is but how well it works. From great minds come great ideas:

    Exhaust Drone is Completely Gone - Ford Mustang Forums : Corral.net Mustang Forum
     
    • Thanks! Thanks! x 1
  12. challenger

    challenger Member

    Messages:
    176
    Likes Received:
    32
    Joined:
    Jul 26, 2013
    Location:
    Hampstead, NC
    It's been raining like mad here so I haven't been able to take the car for a ride with the Dynomax mufflers. There is no point for me to take a ride with the top up because I'll be using the car with the top down in all but emergencies. If I get a drone while riding down the highway I'll think about adding an H pipe. Otherwise I'll leave it alone. I doubt the sound at idle is going to irritate me enough to make me change it.
    Thanks for all tthe great info.
     
    • Like Like x 2
  13. 73Coupe

    73Coupe Active Member

    Messages:
    410
    Likes Received:
    159
    Joined:
    Nov 12, 2014
    Location:
    Belmont, CA
    Sounds like a smooth ride from here...

    far out man.jpg
     
    • Like Like x 1
  14. challenger

    challenger Member

    Messages:
    176
    Likes Received:
    32
    Joined:
    Jul 26, 2013
    Location:
    Hampstead, NC
  15. bluefury361

    bluefury361 Old Man with a Hat

    Messages:
    10,075
    Likes Received:
    5,154
    Joined:
    Mar 9, 2011
    Location:
    Alabama
    There's really no difference between an X pipe and an H pipe. The X crossover will work better in a chose area. TTI offers an H pipe for C body's, I have one on my 69 300. The large factory style mufflers will best reduce the resonance normally heard in the 40-60 MPH range, especially in a convertible. Sound deadner under the carpet goes a long way to help also.

    TTI exhaust kit 2.JPG
     
    • Like Like x 8
    • Thanks! Thanks! x 2
  16. bajajoaquin

    bajajoaquin Senior Member

    Messages:
    1,043
    Likes Received:
    275
    Joined:
    Dec 6, 2013
    Location:
    San Diego
    To go back to your original question, yes, an H pipe will likely make a difference in the issue you describe. Boats have independent exhaust systems and if you don't get them completely in synchronize you can get a harmonic drone out of them. Each "leg" of a dual system can do that too. Or at least my '68 Dart did. I put in an H pipe and the drone went away. Can't say there was any extra power or any quieter, but removed the drone.
     
  17. challenger

    challenger Member

    Messages:
    176
    Likes Received:
    32
    Joined:
    Jul 26, 2013
    Location:
    Hampstead, NC
    A 68 dart hey?
    I have one too. It's a gt convertible. Its completely apart. I totally stripped it after I got it about 12 years ago and had it media blasted and etch primed. I bought a ton of new parts for it such as all new interior, suspension, bumpers, top and Ihave ttwo 340 blocks AND a complete "kit" to build a 360 stroker.
    It was a low miles car with column automatic and batch seats. My plan is (was?) to make it a resto modern build but I have my doubts about being able to amass the coin and motivation to do the job. In the mean time the uniform is sitting in my shop on a rolling dolly I built and the parts are in a storage unit. It would make a really awesome driver and I'd love to have it done so I could take it for a drive and smash my foot through the floor board. :)
     
  18. Big_John

    Big_John Old Man with a Hat

    Messages:
    7,664
    Likes Received:
    3,230
    Joined:
    May 21, 2013
    Location:
    Marcellus, NY
    What muffler did you use? I have that drone in my car and it really bothered me on the last Carlisle trip. We had to run with the top up because of the weather and the drone is worse.

    I've kicked around a couple ideas, including a Hemholtz type resonator, which is basically a capped pipe that you weld on, but I can't see why I need to if I can just find a better muffler.
     
  19. bluefury361

    bluefury361 Old Man with a Hat

    Messages:
    10,075
    Likes Received:
    5,154
    Joined:
    Mar 9, 2011
    Location:
    Alabama
     
  20. bajajoaquin

    bajajoaquin Senior Member

    Messages:
    1,043
    Likes Received:
    275
    Joined:
    Dec 6, 2013
    Location:
    San Diego
    Yep. Mine was a hardtop, also a GT. 318 car. It's crazy to me that now my Imperial is about half the price of a Dart in similar shape. Probably was in 1994, now that I think of it.