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  1. #1
    OpelAus Enthusiast
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    EPA Noise notice

    So! 2.5" exhuast is no good apparently. EPA want me to do a noise test on the sri-t. What do i do ? Click here to enlarge What are my options to pass the test.
    Click here to enlarge Warning: This is an Old Thread
    This discussion is older than 120 days. information contained in it may no longer be current . Please think of the children before resurrecting this ancient thread!

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    VIC Cruise Co-Ordinator sooty's Avatar
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    A) borrow someone else's exhaust for the day
    B) get yours modified with a baffle plate in one of the joins and remove it after
    C) if you want to pass and keep your exhaust legal, get another/better resonator
    Last edited by sooty; 13th April 2011 at 05:20 PM.
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    OpelAus Enthusiast Jerram's Avatar
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    put the old I(stock) exhaust back on for the test, then install a "hotdog" to the exhaust to quieten it when you put it back on.
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    OpelAus Post Whore gman's Avatar
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    It's not the diameter it's the mufflers.

    You can get a 3" past EPA noise with the right noise suppression.

    Two options:

    1) fit another muffler or replace one you have with a larger/better/less straight through one

    2) fit a sound baffle in one of the flange joins (which is literally a metal sheet with holes in it). This will drop sound a lot and is then removable after testing.

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  5. #5
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    got ya. what is the legal db for sri-t?

  6. #6
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    Click here to enlarge Originally Posted by gman Click here to enlarge
    It's not the diameter it's the mufflers.

    You can get a 3" past EPA noise with the right noise suppression.

    Two options:

    1) fit another muffler or replace one you have with a larger/better/less straight through one

    2) fit a sound baffle in one of the flange joins (which is literally a metal sheet with holes in it). This will drop sound a lot and is then removable after testing.

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    sorry for double post, vwhat is best option to keep as is and what is general cost involved?

  7. #7
    OpelAus King Dingaling guy 27's Avatar
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    Click here to enlarge Originally Posted by brc Click here to enlarge
    got ya. what is the legal db for sri-t?
    i'm sure theres another thread on here that says it all. iirc its 95db.
    04 Astra Sri - Silver - Full red leather interior - mk4 888 wheels - Star light roof lining - lowered - ice - exhaust - vxr brakes - quite a few other things.
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  8. #8
    OpelAus Post Whore gman's Avatar
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    Use a baffle plate and you can make 1 for $20 with a plate, a drill and a 6-10mm drill bit.

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    Last edited by gman; 13th April 2011 at 05:36 PM.
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  9. #9
    OpelAus King Dingaling guy 27's Avatar
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    boosted_astra has a spare stock exhaust system. send him a pm and see if he will sell or lend it out.
    Last edited by guy 27; 13th April 2011 at 05:33 PM.
    04 Astra Sri - Silver - Full red leather interior - mk4 888 wheels - Star light roof lining - lowered - ice - exhaust - vxr brakes - quite a few other things.
    my ride - no longer faster than qlds sri-t's
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  10. #10
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    If I get a better muffler etc, will this effect my bhp? What I'm after is a solution that:

    1. Meets EPA standards
    2. Keeps, or at least comes close to the exhuast I have.

    Will a baffle plate effect the speed of my car? or just silence it a bit?

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