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  1. #1
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    Default Muffler choice help needed

    Hey guys, I have a H series ute that has fresh 308 and peacemakers.
    One exhaust place recommends magna flow copy offset ovals and the other place recommends straight through round stainless... both twin systems with balance pipe / cross over.

    I want a decent sound and nice note, but not deafeningly loud so it gives me a headache.

    What do you guys recommend, i know stuff all about mufflers.

    Thanks in advance.
    Cheers
    Last edited by Adam76; 01-06-2018 at 03:28 PM.

  2. #2
    Part of the furniture Deuce.'s Avatar
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    I would go with the first place. A chambered muffler on each side should sound good

  3. #3
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    HI
    U need to no your muffs ha ha ..

    The larger the muffler the more sound deadening

    offset/ centre
    centre /centre
    double offset
    the above is pipe configuration IN/OUT no influence on noise

    straight thru
    triple pass
    centre chambered
    baffled centre chamber [wall with hole ]

    Flow master do it [reduce noise ] with different shaped sheetmetal internall baffles

    304 stainless is a great shiny finish but can crack
    409 stainless is a lesser finish but tolerate heat better

    Recommended if u have a strong motor is
    extractors /H pipe
    2 x resonators along by the tail shaft biggest diameter and longest u can fit
    2 x mufflers 14long x 8 inch wide x 4or 5 inch high straight thru type
    customs muffs canbe 16 inch long upto 10 inch wide upto 6 inch high

    Now 2 inch , 2 1/4 or 2.5 inch diameter tubing

    system would be loud but not deafening with a sweet note either 2 1/4 or 2.5 inch

    If u keep to std muffler size u can always swap them out

    I have to eventually fit an exhaust to mine and have found this out by asking muffler shops that do a lot of early cars with plenty of experience .

    What extractors do u have Tri y`s or 4 into 1 ????
    Last edited by swampy; 02-06-2018 at 01:17 PM. Reason: none

  4. #4
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    I've got tri y's, into 2.5" collectors and twin 2.5" all the way with 2 offset in offset out 16" mufflers and 2 14" hotdogs at the very rear.

    It's very quiet while cruising but very loud and throaty when you stand on it. Very happy with mine.

  5. #5
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    Hi
    cbw
    Is that a HQ etc or another car . Engine ?? Interested in the 14" hotdogs ,any idea on the outside diameter .

  6. #6
    Not the Kingswood! hq308's Avatar
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    Resonators would probably need to go at the back on a ute, mufflers are normally mounted just past the back of the cab opposite the fuel tank. An oval shaped muffler will fit better than a round one.

    The only other thing I'd add is chambered mufflers are usually a bit louder than a new packed muffler but tend to stay the same as long as they aren't damaged. A packed muffler will generally get louder as the packing is worn out and end up louder than a chambered muffler.

  7. #7
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    Quote Originally Posted by Deuce. View Post
    I would go with the first place. A chambered muffler on each side should sound good
    Thanks deuce, so round chambered mufflers on each side.
    What is a chambered muffler?
    Cheers

  8. #8
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    Quote Originally Posted by swampy View Post
    HI
    U need to no your muffs ha ha ..

    The larger the muffler the more sound deadening

    offset/ centre
    centre /centre
    double offset
    the above is pipe configuration IN/OUT no influence on noise

    straight thru
    triple pass
    centre chambered
    baffled centre chamber [wall with hole ]

    Flow master do it [reduce noise ] with different shaped sheetmetal internall baffles

    304 stainless is a great shiny finish but can crack
    409 stainless is a lesser finish but tolerate heat better

    Recommended if u have a strong motor is
    extractors /H pipe
    2 x resonators along by the tail shaft biggest diameter and longest u can fit
    2 x mufflers 14long x 6 inch wide x 4or 5 inch high straight thru type
    customs muffs canbe 16 inch long upto 10 inch wide upto 6 inch high

    Now 2 inch , 2 1/4 or 2.5 inch diameter tubing

    system would be loud but not deafening with a sweet note either 2 1/4 or 2.5 inch

    If u keep to std muffler size u can always swap them out

    I have to eventually fit an exhaust to mine and have found this out by asking muffler shops that do a lot of early cars with plenty of experience .

    What extractors do u have Tri y`s or 4 into 1 ????
    Hey swampy, I'm married now so I only know one muff..... 😂

    Thanks for the detailed info.

    I'm pretty sure i went with the tri-y for better low end torque.

    So from what you have written, you are suggesting an oval style muffler rather than a round style muffler, is that right?

    And you're also suggesting 2 resonators. Do the resonators go before the mufflers or after the mufflers?

    I'm going with the 2.5" pipes.

    Thanks for answering my questions.
    Cheers.

  9. #9
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    Quote Originally Posted by hq308 View Post
    Resonators would probably need to go at the back on a ute, mufflers are normally mounted just past the back of the cab opposite the fuel tank. An oval shaped muffler will fit better than a round one.

    The only other thing I'd add is chambered mufflers are usually a bit louder than a new packed muffler but tend to stay the same as long as they aren't damaged. A packed muffler will generally get louder as the packing is worn out and end up louder than a chambered muffler.
    Thanks hq.
    I think what the first guy wants to do is just run the 2.5 pipes all the way to the rear of the ute, and then have the two round style mufflers on each side at the rear just before the tail pipes exit the back.

    Personally I'm concerned this will be hell loud and possibly may drone at cruising speed??

    Thanks for your thoughts.
    Cheers

  10. #10
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    Hi
    Adam I was referring to a sedan but the principles the same .
    Still run 2 mufflers and 2 resonators .
    Most likely sizings are different [ Many brands all do different sizes also]
    Just the lay out is different .

    Just fit the biggest possible applies to rezzys and muffs
    The bigger the heavier the muff the deeper and better quality sound
    Although u w`ont get a choice when I have replaced industrial cheap muffs with double thickness and double insulated the sound quality is ALWAYS BETTER

    There is the 2x standard glass packed chambered also
    The pdf will show some of the basic muffler options str thru/ centre baffle chambered /no centre baffle chambered / triple pass /

    http://redbackperformance.com.au/pdf...er-barrels.pdf

    Hooker
    Flow Master I`m sure they do baffle only muffs no fibre glass often called chamber mufflers

  11. #11
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    Quote Originally Posted by swampy View Post
    Hi
    cbw
    Is that a HQ etc or another car . Engine ?? Interested in the 14" hotdogs ,any idea on the outside diameter .
    HJ 308 ute. Crow 5666, VL big valve heads home ported with .020 off, zero decked but dishtops, regraphed hei and performer manifold.

    Outside diameter of hotdogs is around 3.5-4" just looking by eye.

  12. #12
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    hi
    cbw
    Does your car drone at constant speed ??

  13. #13
    Part of the furniture Deuce.'s Avatar
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    Quote Originally Posted by Adam76 View Post
    Thanks deuce, so round chambered mufflers on each side.
    What is a chambered muffler?
    Cheers
    Chambered muffler (like hooker aerochamber or flowmaster) basically is a big open box with a few walls the gas snakes around. Theory being: the positioning of the walls cancels out certain sound waves, but doesn't affect flow.
    Google them for a good picture of internals and it will make more sense.

  14. #14
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    Quote Originally Posted by swampy View Post
    hi
    cbw
    Does your car drone at constant speed ??
    Not at all, but i do have a th700 so usually sits at 1400-1800rpm when cruising. It's only loud when you open the throttle more than 1/3 or so. I'm very happy with mine. Was to suit a tonner and didn't line up with my extractors/crossmember so I had to cut it all up and reweld to make it fit.

    Last edited by cbw_09; 02-06-2018 at 10:42 PM.

  15. #15
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    Hi
    Adam76

    Ceramic fibre packing instead of fibreglass is preferred. The ceramic matting is highly resistant to blow out /high temps . Compared to a standard muffler inner tube is first wrapped in stainless /steel wool . Then wrapped in fibre glass on the outer . As people have mentioned all this eventually blows out .
    Summary of this is a fibre glass packed muffler is not the greatest investment .

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