Do it yourself muffler delete with a muffler!

Discussion in 'DIY' started by WildHorse, Mar 16, 2020.

  1. Jay-rod427

    Jay-rod427 Well-Known Member

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    Good call on putting the flex pipe in there. Leaving the muffler open would echo and sound like ass. Kinda like hollowing out cats, it sounds terrible.
     
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  2. OP
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    WildHorse

    WildHorse N/A or GO HOME

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    Yeah.. I had a sneaky suspicion it would have echoed like crazy. Like every subwoofer box out there.
     
  3. Jackthewack

    Jackthewack Well-Known Member

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    I'm guessing re face lift mustangs muffler. I have 19 I wonder what's in my mufflers? They are heavy af!!! I think 30lbs each just picking them up. I am also interested in a sound clip. I also wonder if you put some of the baffling like the straight throu mufflers have what kind of difference you could make. I want to dropp the weight down but I don't want to be too loud like the coursa extremes or roush axle backs
     
  4. OP
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    WildHorse

    WildHorse N/A or GO HOME

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    #19 WildHorse, Mar 21, 2020
    Last edited: Mar 23, 2020
    No need for baffling as it bypasses the muffler completely.

    Here's a clip of some other guys 17. Albeit it still has the suitcase on it.
     
  5. OP
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    WildHorse

    WildHorse N/A or GO HOME

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    SO I took the advice of a earlier commenter and decided just to secure the lid on the muffler instead of welding it on. Easy access in case something comes loose. Then just chromed taped the seams to keep the nasty out. :thumbsup:
     
  6. Mustang_Lou

    Mustang_Lou Well-Known Member

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    … or you want to add some fiberglass packing to "tune" the sound to your liking.
     
  7. OP
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    WildHorse

    WildHorse N/A or GO HOME

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    Finally got the parts to finish off the second muffler. FYI deliveries seemed to have slowed a wee bit. Now to button it all up and let the insanity testing begin. Oh and to answer a deleted comment, yes I can afford a "real" axleback. More to come! 20200327_120534.jpg
     
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    WildHorse

    WildHorse N/A or GO HOME

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    Ok.. so with it plus 12c today, roads basically empty due to the rona, I buttoned everything up, took it for a rip.

    COLD START: Loud, but not obnoxiously loud.
    WARM IDLE: sounds exactly like a 1965 289cid/306hp Mustang GT350 competition
    CRUISING UNDER 3000 rpm: sounds exactly like a 1965 289cid/306hp Mustang GT350 competition
    OVER 4000 rpm: sounds exactly like a 1965 289cid/306hp Mustang GT350 competition
    WOT: sounds exactly like a 1965 289cid/306hp Mustang GT350 competition but much louder.

    Firing orders are close:
    SBF 1-5-4-2-6-3-7-8 (early 289/302)
    Modular 1-5-4-8-6-3-7-2 (5.0 coyote)
    cyl 2&8 cyl 3&7 are swapped.

    I like it, I like it a lot! By camera sound sucks. So to get a good idea here ya go:
     
  9. Joe 5.0

    Joe 5.0 Well-Known Member

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    I'm not sure if you've done this already, but I think you can save time and money on rustproofing the interior. I doubt the muffler will rust out.

    Great job on the DIY. I have a full exhaust already, but I still love these custom projects. They're always interesting.
     
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  10. OP
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    WildHorse

    WildHorse N/A or GO HOME

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    Thank you Sir! I need to get a proper gopro to make some good quality videos to try and capture that awesome sound! Oh and yesterday I took it for a drive (clear skies, 15 degrees celsius), and did the 'drone' test, 30 mph in 5th gear varying the amount of throttle given. Result was zero drone, I'm a happy camper! Except for today, I'm looking at close to 30cm of snow outside and -4c haha.
     
  11. OP
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    WildHorse

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    Idle
    c_oc=AQnm3RJd_3dn-g-gTvJXAq53aeZtoDzQW2RxZjiYnorcxEIur8a0fU8TyDKZry12NJM&_nc_ht=scontent.fybz2-1.jpg
     
  12. OP
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    WildHorse

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    So now that everything works as intended, was time to take everything apart and weld it up all proper like. Inside the muffler, weld the lid back on, weld it back to the axleback. Nice. Sunny day. Then it snowed. On April 20th. You can stop this bullshit anytime now Ma Nature.93916347_2931269946967951_5652029223250952192_o.jpg 93479379_2931270103634602_2650737941168521216_o.jpg 94377539_2931270246967921_4664595321114853376_o.jpg
     
  13. Mustang_Lou

    Mustang_Lou Well-Known Member

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    It's been a bizarre April for sure here too … basically had all 4 seasons in 1 day several times last week.
     
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  14. OP
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    WildHorse

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    #29 WildHorse, Apr 21, 2020
    Last edited: Apr 22, 2020
    Follow me for more recipes.
     
  15. OP
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    WildHorse

    WildHorse N/A or GO HOME

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    Some bombing around
     
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