whats the quietest muffler

Discussion in 'High Tech Retrofits' started by hessdawg, Dec 11, 2011.

  1. FlaJunkie

    FlaJunkie Veteran Member Lifetime Gold Member

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    On the street? How well?
     
  2. muscl car

    muscl car Veteran Member Lifetime Gold Member

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    12.5:1 427 bbc with all the speed parts of that era ,with a M22 4spd and verti gate and a 12 bolt with 4.56 gears .i ran it a couple times at fremont drag strip in northern calif and it went 11.90 .on the street with the M22 and those 56's it came out of the hole very hard . as street racing is not allowed on nasty Z i'll just say it ran very on the street
     
    Last edited: Jan 3, 2012
  3. FlaJunkie

    FlaJunkie Veteran Member Lifetime Gold Member

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    Sounds like it would.
     
  4. DirtyScotty

    DirtyScotty Veteran Member

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    My 81 had a 2.5 inch true dual setup with flowmaster delta flows. Engine was a 383 stroker. it was kinda loud till i put in the X-pipe. What a difference. Idle was still kinda loud but my exhaust exited by the axle under the car so i am sure it was sound bouncing too. Driving was actually too quiet to me. Like really silent. I wonder what the car would have sounded like with the same exhaust and tailpipes out the back like stock.
     
  5. hessdawg

    hessdawg Veteran Member

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    I think Im gonna try and raise the floor behind the drivers seat so I can fit a full 20 inch muffler underneath instead of a 14
     
  6. daniel76309

    daniel76309 Veteran Member Lifetime Gold Member

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    That's what I did--there was a big difference going from the smaller Dynomax to the longer ones (much quieter), and supposedly flows about the same. As long as no one sits in the back seat (or if they do, they have very small feet), it is a good way to go. :)
     
  7. Kamikaze

    Kamikaze Veteran Member Lifetime Gold Member

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    But he also bought those super cheap from me and installed them in our parking lot...
     
  8. hessdawg

    hessdawg Veteran Member

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    Update

    So I ordered 2 dynomax aka walker hemi super turbos. The large 20inch case

    I took some reading with my hand held spl meter 3 feet from the end of the pipe

    Olds 455 Idle. 3000 rpm
    Header 117db. 120 db
    Pipes no muffler 112db. 115db
    Flowmaster 40. 100db. 106db
    Hemi super turbo. 97db. 100 db
     
  9. daniel76309

    daniel76309 Veteran Member Lifetime Gold Member

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    Just curious how you like them...Are you happy with the way they sound, etc.?
     
  10. hessdawg

    hessdawg Veteran Member

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    I think My goals are a little un realistic. I drive a 01 civic and id like it a little louder than that.so with that being said, they are a little louder then I was hoping for. Right now they are clamped on to my old H pipe exhause with dumps.
    I think with new x pipe exhaust and a pair of vibrant performance resonators at the rear bumper I will be happy with the quietness of the exhaust
    And then with the flick of a switch and the electric cutouts open and I'll have the best of both worlds
     

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