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  •  » Side exit exhaust with H-pipe?

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    9/02/2019 10:25 AM  #1

    92vanguard
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    From: Aurora, CO
    Registered: 3/05/2014
    Posts: 61

    Side exit exhaust with H-pipe?

    I have a 351W bored and stroked to 400cid, nickel plate long tube headers. Wanting to go with a side exit exhaust. I'm planning on using 2.5" tube and Dynomax Super Turbo mufflers with the entry and exit on the same side so I don't have to use glasspacks or make a big loop out the backside of a muffler.

    In such a short exhaust system, is it worth having a crossover (H or X)? Or is there still benefit other than the sound difference? 

    Last edited by 92vanguard (9/02/2019 10:26 AM)

    Scott Williams- 1969 Pete Revson tribute
     

    9/02/2019 3:32 PM  #2

    6sally6
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    From: Surfside Beach,SC
    Registered: 4/02/2013
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    Re: Side exit exhaust with H-pipe?

    All the "experts" have come back now and say.......other than changing sound and "balancing-the-exhaust-gases" there really isn't a significant power boost from using an X/H-pipe set-up in a street application. Maybe high RPM /Cup racing butt-knot street apps.  They DO reduce exhaust drone when using Blowmaster-40's and NOT running tailpipes butt power boost....uhhhhh nope!
    Suggest using largest tubes possible and soft bends in the pipe. (I REALLY vote for zero mufflers buttt..I know how that would go over)
    6sal6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    9/02/2019 4:10 PM  #3

    92vanguard
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    From: Aurora, CO
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    Re: Side exit exhaust with H-pipe?

    6sally6 wrote:

    Suggest using largest tubes possible and soft bends in the pipe. (I REALLY vote for zero mufflers buttt..I know how that would go over)
    6sal6

    I drive this thing almost daily in the summer and can't stand the noise, and "drone" noise is a no go for me. So maybe starting with 3" into a 2.5" H before the muffler (which only comes in the 2.5" flavor). Maybe reducing into 2" at the tip.

    I've heard and read that as the exhaust cools it slows down, so a reduction of diameter forces the speed to stay up. Anyone think is bunk? Or only matter with high revving race motors?

    Scott Williams- 1969 Pete Revson tribute
       •Thread Starter
     

    9/02/2019 5:09 PM  #4

    6sally6
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    From: Surfside Beach,SC
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    Re: Side exit exhaust with H-pipe?

    Sounds good to me (pun intended!)......even if it IS a race engine  trick don't see how it could 'hurt' if done on the street.
    6sal6
    PS....But what about the megaphone tip theory were the mega phone creates a negative pressure wave which draws-out/slight vacuum the exhaust for a more complete fill of the combustion chamber?

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    9/02/2019 6:25 PM  #5

    92vanguard
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    From: Aurora, CO
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    Re: Side exit exhaust with H-pipe?

    6sally6 wrote:

    But what about the megaphone tip theory were the mega phone creates a negative pressure wave which draws-out/slight vacuum the exhaust for a more complete fill of the combustion chamber?

    I haven't heard that one. Maybe reduce the size and end with a 6" fart can tip like a Honda? Surely that's worth 50hp. 

    Last edited by 92vanguard (9/02/2019 6:27 PM)

    Scott Williams- 1969 Pete Revson tribute
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    9/02/2019 7:26 PM  #6

    Steve-G
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    From: Glen Rose,TX
    Registered: 4/01/2013
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    Re: Side exit exhaust with H-pipe?

    If nothing else. It stabilizes the exhaust system.

     

    9/03/2019 4:47 AM  #7

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
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    Re: Side exit exhaust with H-pipe?

    It definitely provides a point that keeps the individual pipes from being able to roll.  It definitely changes the sound.  Power wise, couldn't say for sure.  In theory you are taking advantage of maximum scavenging by always having draw through the system since all 8 cylinders are now in effect connected instead of essentially having two straight 4s with their own exhaust. 

     

    9/03/2019 6:00 PM  #8

    6sally6
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    From: Surfside Beach,SC
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    Re: Side exit exhaust with H-pipe?





    Is this a viable option?!
    6s6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    9/03/2019 6:02 PM  #9

    6sally6
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    From: Surfside Beach,SC
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    Re: Side exit exhaust with H-pipe?


    photoupload

    Love this 'new' picture/image thingy!

    This is the 'grandpa'of the X-pipe...I think
    6s6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    9/04/2019 5:29 PM  #10

    92vanguard
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    From: Aurora, CO
    Registered: 3/05/2014
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    Re: Side exit exhaust with H-pipe?

    Those are all insane.
     

    Scott Williams- 1969 Pete Revson tribute
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    9/04/2019 6:05 PM  #11

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
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    Re: Side exit exhaust with H-pipe?

    Well we do live in an insane world...

     

    9/04/2019 7:31 PM  #12

    Nos681
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    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
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    Re: Side exit exhaust with H-pipe?

    Mike... looks like you’ve got the hang on pics now.🤙🏼
    Looks like the Doug’s equal length headers took #4 and #8 and swapped sides only so all pipes could be equal length.
    Novel idea...except for possibly scorching your oil.
    Bet those must have been fun to work around...street or racing.
    Stay safe!

     

    9/04/2019 8:05 PM  #13

    C9ZZ
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    From: Bossapolis, MN
    Registered: 4/01/2013
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    Re: Side exit exhaust with H-pipe?

    Try Spintech.  https://spintechmufflers.com.  They make a side exhaust for Mustangs.  Looks like it needs an X or H pipe.

    Volvo!
     

    9/06/2019 4:29 PM  #14

    6sally6
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    From: Surfside Beach,SC
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    Re: Side exit exhaust with H-pipe?

    Nos681 wrote:

    Mike... looks like you’ve got the hang on pics now.🤙🏼
    Looks like the Doug’s equal length headers took #4 and #8 and swapped sides only so all pipes could be equal length.
    Novel idea...except for possibly scorching your oil.
    Bet those must have been fun to work around...street or racing.
    Stay safe!

    Believe it or not...........those came "factory"!  (60's stuff.....it'll never be equaled)
    6s6
     

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    9/09/2019 12:55 PM  #15

    TimC
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    From: Wheaton, Illinois
    Registered: 4/01/2013
    Posts: 876

    Re: Side exit exhaust with H-pipe?

    C9ZZ wrote:

    Try Spintech.  https://spintechmufflers.com.  They make a side exhaust for Mustangs.  Looks like it needs an X or H pipe.

    We've got these spintech's on the 66 with an X pipe.  Love the sound, but louder than most folks would like.  Spintech does make street mufflers.  These XR-90's are more of a race muffler.

    https://spintechmufflers.com/xr90-sportsman/

     

     

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