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Exhaust too loud.Problems all the way!

This is a discussion on Exhaust too loud.Problems all the way! within the General Help forums, part of the LSx Technical Help Section category; Hi, did anyone knows how much db makes a Magnaflow catback on a 1999 Z28? In germany the cars have ...

  1. #1
    Junior Member Endorphin187's Avatar
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    2001 Z28

    Exhaust too loud.Problems all the way!

    Hi,

    did anyone knows how much db makes a Magnaflow catback on a 1999 Z28?

    In germany the cars have a very strictly db limit.For example in my carpapers are 85 db registered.That means the absolutely limit is 90 db.I`m really f*cked up when i cant reduce the noise to max 90 db!!What can i do?

    How much db can i reduce with a Apexi DECS ECV ?
    And has anyone experience with this type of silencers?


    ----------------------
    Some future Questions:
    How much db makes the Pacesetter LT`s extra?
    And what changes makes a Hot cam kit to the db level?

  2. #2
    Senior Member GULLETT17's Avatar
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    00 TA PWTR, 98 VertTA NBM
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    from ls1sounds.com, but the car was a 5.0 mustang:

    Sound Off in Quietest to Loudest (Decibels):
    1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
    2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
    3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
    4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
    5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
    6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
    7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
    8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
    9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
    10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
    11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
    12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
    13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
    14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
    15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
    16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).

  3. #3
    Junior Member Endorphin187's Avatar
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    [QUOTE=GULLETT17;1267325]from ls1sounds.com, but the car was a 5.0 mustang:

    Sound Off in Quietest to Loudest (Decibels):
    3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
    QUOTE]

    Perfect, and i must have 85 db @ 26000 rpm nominalspeed!!

    How much db can i reduce with silencers or/and a exhaust valve?

  4. #4
    Senior Member GULLETT17's Avatar
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    00 TA PWTR, 98 VertTA NBM
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    not sure . . . i haven't had much experience with them. sound level isn't really an issue where i live unless its something like open headers! i do have the magnaflow catback and i cant see that db level would be an issue with it. you really have to get on it for it to be "loud". its mostly deep, smooth, and mellow.

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    Junior Member Endorphin187's Avatar
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    Are open Headers Long Tube Headers?
    I bought some Pacesetter LT`s.Are there so loud????I hope not!!

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    Senior Member 35thAnniZ28's Avatar
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    dood hell yeah the car will get louder...try those silencers on...i think you would have to get them welded on i part of the exhaust...might be a restriction so be prepared to lose power

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    Senior Member GULLETT17's Avatar
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    00 TA PWTR, 98 VertTA NBM
    80 TA BLK, 80 Formula NBM

    Quote Originally Posted by Endorphin187 View Post
    Are open Headers Long Tube Headers?
    I bought some Pacesetter LT`s.Are there so loud????I hope not!!
    Open headers is exhaust with no mufflers or cats. Just headers.
    Long tub headers are the type of headers opposed to midlength or shorties.

    Your pacesetters are goin to be loud depending on what exhaust you put on. I've heard the LT's sound amazing with magnaflow but i dont know how "loud" it is.

  8. #8
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by Endorphin187 View Post
    Hi,

    did anyone knows how much db makes a Magnaflow catback on a 1999 Z28?

    In germany the cars have a very strictly db limit.For example in my carpapers are 85 db registered.That means the absolutely limit is 90 db.I`m really f*cked up when i cant reduce the noise to max 90 db!!What can i do?

    How much db can i reduce with a Apexi DECS ECV ?
    And has anyone experience with this type of silencers?
    Click for full size

    ----------------------
    Some future Questions:
    How much db makes the Pacesetter LT`s extra?
    And what changes makes a Hot cam kit to the db level?
    It will quiet it a little bit. They mostly eliminate rasp.

  9. #9
    Junior Member Endorphin187's Avatar
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    And my next problem:

    Termination of production from the DECS ECV.Now im really

    Are there other producers with ECV`s ?I cant use a manual.

  10. #10
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    2000 Trans Am

    Too Loud Exhaust?? Is there such a thing?? ... lol

    I had the Magnaflow and it sounded great. Not too loud at idle but screamed when you opened it up

  11. #11
    Senior Member 35thAnniZ28's Avatar
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    summitracing.com !

  12. #12
    Junior Member Endorphin187's Avatar
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    I know that the Mag` sounds awesome!But our cops dont like awesome exhausts!!

    Always cars for the rich people can have a cool sound,like Porsche,Lambo...
    I hate our laws in germany

  13. #13
    Senior Member 35thAnniZ28's Avatar
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    i meant look through the magazine they have those silencers your looking for

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    Member Tracker9118's Avatar
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    Senior Member 35thAnniZ28's Avatar
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    psh...wow what help ^

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    Sarge for AAG Emperor hutch1999's Avatar
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    [QUOTE=Endorphin187;1270254]
    Quote Originally Posted by GULLETT17 View Post
    from ls1sounds.com, but the car was a 5.0 mustang:

    Sound Off in Quietest to Loudest (Decibels):
    3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
    QUOTE]

    Perfect, and i must have 85 db @ 26000 rpm nominalspeed!!

    How much db can i reduce with silencers or/and a exhaust valve?
    why would they make you test at 2600rpms? When shifting normal in my car I rarely hit 2600rpms and on the highway im right around 2000. I would try to explain that 2600rpms is not a normal cruise range and would try to get them to test it at around 2000rpms.

  17. #17
    Junior Member Endorphin187's Avatar
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    German rules.
    300 PS @ 5200rpm in the papers,the tester says half nominalspeed when its over 5000rpm (my 2600) and when the nominalspeed is under 5000 then the test is at 3/4 nominalspeed.

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