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Thread: 4AGTE exhaust size

  1. #1
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    Default 4AGTE exhaust size


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    Car - Daihatsu Charmant

    motor / part in question - 4AGTE exhaust

    problem - What diameter

    occurs/started when (if applicable)- not yet

    personal situation (if applicable)- I like cake


    What size piping for a 4AGZ with T25 from SR20? Going to run on AE101 ecu for now and was thinking of 3" down to where the cat
    would be normally but would I keep it 3" all the way back or would there be an advantage in stepping down the pipe size to say 2 1/2" to the silencer box?
    Also as a road car I don't want it to be silly loud.
    Thanks.

  • #2
    Senior Member blinded's Avatar
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    I run a full 3" system in my car with a centre and rear exhaust. Turbo is a KKR330 which is about the same size as a t25 I believe. Also, mine is a daily and I would say the exhaust note is pretty quiet, I'd almost say legal actually!
    4K > 5K > Worked 5K > 4AGE > 146RWKW 4AGTE > 210KW SR
    Alex's 4AGTE KE70
    Rest In Peace Old Faithful Corolla-Taken Too Soon 2006-2013...
    Or so was thought...
    Now with a new lease on life will be back bigger and better!

  • #3
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    3" if it'd fit... 2.5" won't choke it too bad, but defo try to get 3"

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    Veteran FAST EDDIE's Avatar
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    2.5 will do fine unless your making 200kw
    AE86 THE BEST

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    +1 on 2.5
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    Senior Member Vaughn's Avatar
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    There was a thread about exhaust sizes that was for 20v though, but i would expect around the same size. supposed 3" is best
    Just another Muppet

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    im running 3" to my "cat" and 2.5 from there back.... but not by choice. would much peffer 3" all the way.

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    should make the dump and front pipe out of 3", then you can drop it to 2.5" from there to the back. this is fine on one ta22 4agte 20v i know of that makes over 200rwkw on 19psi.

  • #9
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    I got a CX Racing T25/8 to V band adaptor to suit 3" piping which I am going to run down to the cat area.
    I was going to do a step down decat pipe and use an AE86 cat back I have here, but then I was thinking I'd just get
    a full system made up.
    Sounds like 2.5" will work fine so thanks.

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