Muffler comparison

Discussion in 'Street/strip 400/430/455' started by eagleguy, Apr 13, 2019.

  1. eagleguy

    eagleguy 1971 Skylark Custom

    Stock BBB with 2.5 dual exhaust with x-pipe. Magnaflow or Flowmaster mufflers? Looking for a non tinny deep sound at idle and a bark when stepped on. Is just straight pipe with no X or H a better choice?
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    Flowmasters are too raspy for my taste. I like my Magnaflows. You should go to your local cruise night, listen to cars, and talk to the owners about what they are running. That's how I decided on the Magnaflows. For a 2 1/2" system, it's hard to beat the Walker 17749 mufflers.
    Mark Demko, Mike B in SC and pbr400 like this.
  3. johnriv67

    johnriv67 Well-Known Member

    Currently a big supporter of the dynomax ultraflows
  4. RoseBud68

    RoseBud68 Well-Known Member

    Sound is subjective....What you like i may not. That being said, i have a set of Flowmaster 2.5 system but that was installed in the late 1980 when that was the go to sound.
    I'll take Larry's advice and head over to your local cruise night and have a listen.
  5. eagleguy

    eagleguy 1971 Skylark Custom

    I have gone to shows and asked questions. Problem is that nobody has the same style exhaust resulting in a very different sound from the same mufflers. That's the reason I was looking for a general opinion. Best way to describe my desire is that I am looking for that grunt sound at idle/ opened up without that tinny metal sound on acceleration /de-acceleration.
  6. bigce1972

    bigce1972 Well-Known Member

  7. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    That's just it Steve, everybody's exhaust is a bit different. Even the type of engine, compression and cam have a bearing on sound. I think you will find a lot of guys run the 17749 walker long case mufflers and LOVE them. I did back when I had a 2 1/2" system. They were quiet at cruise but screamed when you nailed it. Nice rumble at idle. That is the way my Magnaflows are and what I was looking for. I have the 470 with the small roller cam, MT headers, dual 3" with X pipe, and N25 exhaust out of the bumper (that changes sound as well). This is me leaving a cruise night.

    Last edited: Apr 13, 2019
  8. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"


    BUICKRAT Torque Rules!

    Love my Dynomax. I get a lot of comments about how good it sounds.
  10. DasRottweiler

    DasRottweiler -BuickAddict-

    Mild 462 with M/T Super Scavengers into Torque Tech 3" & Dynomax Super Turbo 17792.....Jim
    Last edited: Apr 18, 2019
  11. johnriv67

    johnriv67 Well-Known Member

    TA 2.5" Dynomax ultra flow, very low in person, video (without headphones) picks up the high frequencies
    430 bottom end, big port heads, mild cam, stg 1 springs, oil pump mods
    SpecialWagon65 and RoseBud68 like this.
  12. Gary Bohannon

    Gary Bohannon Well-Known Member

    I have used the 17749 Walker and now use the Walker Ultra flows.
    Love them both. Ultra flow is a little louder, but maintains mellow sound at any speed.
    My friend has Flowmasters and I would never tolerate them! Hit the throttle and aleart cops all over town...!
    Mark Demko and Mike B in SC like this.
  13. eagleguy

    eagleguy 1971 Skylark Custom

    Thanks Larry
  14. docgsx

    docgsx It's not a GTX

    Don’t even know what this guy has but I sure do like it!

  15. docgsx

    docgsx It's not a GTX

    Here’s mine, 462 with a fat cam. 3 inch mandrel bent system with T/A headers. 40 series Flowmaster’s with 3 inch tail pipes and no crossover.

  16. 436'd Skylark

    436'd Skylark Sweet Fancy Moses!!!!!

    Don't worry about the X or H pipe. No real horsepower gain for the money spent. You're much better off putting that money elsewhere.
    rmstg2 and docgsx like this.
  17. sriley531

    sriley531 Big green hunk of $#*^....

    As others have said, it's such a personal preference thing, and even then pipe arrangement, muffler position, and a ton of other variables can change the sound. I had magnaflows on my car for a few hundred miles, and was impressed with how quiet they we're at cruising rpm but turned up to 11 when smashing the loud pedal. That said, the tone just wasn't what I wanted. Flowmasters have a nostalgic place in my heart, so that's what I went with. Not right wrong or indifferent, just my preference.

    Just for reference....

    With magnaflows:

    Flowmasters (summit copies actually) :
    Last edited: Apr 15, 2019
    docgsx and RoseBud68 like this.
  18. gsgtx

    gsgtx Silver Level contributor

    I know on my 440 mopars with a h-pipe they would have some drone. on the other hand there not loud and flow great.
  19. 87GN_70GS

    87GN_70GS Well-Known Member

    No real power gain but they do change the sound. H-pipe gives you a deeper tone, X-pipe gives you that raspy V6 UPS truck sound (twice as many exh pulses per side doubles the frequency)
  20. 1969RIVI

    1969RIVI Well-Known Member

    Here's my Riv don't mind the blurry video, I'm pretty sure the mufflers are flowmasters (possibly magnaflow??) the PO put them on. The pipes are side exit and dump out right in front of the rear tires.

    OZGS455 and johnriv67 like this.

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