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  1. #21
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    Quote Originally Posted by 4u2nv View Post
    ok i have a k20 in a eg bubble and it has a 2.5 inch exhaust is it worth it to change it to 3inch?? and if i change it to 3inch how much power difference will it make??

    keep the 2.5", thats all you need.


  2. #22
    K Series K20EF9's Avatar
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    Quote Originally Posted by StinkyTurbo View Post
    No he should go with a 3 inch exhaust. There is a thread on K20a.org concerning this & K series motors make more power with 3 inch exhausts no matter if its stock or fully built. The OP should go with a 3 inch if he really wants to make POWER.



    I dont think that the back pressure myth applies to any motor. I think any motor benefits from a bigger, free flowing exhaust.
    I agree, the whole back pressure myth is just that a myth, even a d15 will benefit from a 3 inch compared to a 2 inch.

    The best exhaust is no exhaust. NA or Boost.
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  3. #23
    Senior Member 2200ccCRXsi's Avatar
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    Quote Originally Posted by flameboy View Post
    Here we go again with back pressure, it doesn't apply to k20 motors.
    k20 don't need back pressure, it's proven to gain more power from 3" exhaust, speacially if you got something to tune it with.
    Yes it worth getting 3" inch exhaust.

    With tune you'll probably gain 5-10whp at the peak but most important is all thru the rpms.
    what!??!?! correct me if im rong please! are k series engines like the gods of engines?!?! ive never heard of an engine that does not benefit from back pressure... the only time back presure is not really needed is on turbo applications. but like i said correct me if im wrong
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  4. #24
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    Quote Originally Posted by 2200ccCRXsi View Post
    what!??!?! correct me if im rong please! are k series engines like the gods of engines?!?! ive never heard of an engine that does not benefit from back pressure... the only time back presure is not really needed is on turbo applications. but like i said correct me if im wrong
    Dyno says back pressure is not needed.

    flameboy saves the day

  5. #25
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    3" + is for turbo cars....

  6. #26
    Senior Member 2200ccCRXsi's Avatar
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    lol... maybe you should close this thread. its gonna turn into an argument. all engines need back pressure. maybe the k20 doesnt need it as much as others. but theoreticaly all engines need it. unless boosted.
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  7. #27
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    Engk........................

    flameboy saves the day

  8. #28
    sab
    sab is offline
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    just got me a 3" thermal for my car d series.
    Quote Originally Posted by Mike Hunt View Post
    obviii broooo.

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