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This is a discussion on ray need help within the Engine Performance forums, part of the Tutorials & DIY category; what is beter to use a 4.5 bell or 3 in o a down pipe for a 08 wrx...

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    ray need help

    what is beter to use a 4.5 bell or 3 in o a down pipe for a 08 wrx

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    suppp

    so what what can i do to get more power

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    The Default One SeattleJeremy's Avatar
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    Hello, and welcome to ClubWRX!

    Here is a thread that addresses your question.
    Engine Performance FAQ [[[READ ME]]]

    Oh, and a bell mouth exhaust is always better, both types work, but bell mouth is better.

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    rayray

    what is beter though 3 in or 4.5 bell mouth
    and dous the cool air intake actually work

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    DUB
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    Stop posting immediately. Read everything contained herein: Unabomber's Manifesto - NASIOC Then you may resume posting.

    Oh, and welcome to the club.

  7. #6
    The Default One SeattleJeremy's Avatar
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    I think the information from this post should be copied here too
    2.5'' Downpipe Options
    Quote Originally Posted by ramonsalvador08 View Post
    what is beter a 3" bell or 4.5" bell on a 08 wrx
    Quote Originally Posted by jeremy96gase View Post
    Ray, I think you're confused. There is no such thing as a 3" bell.

    jpjester, There is no such thing as a 4.5" exhaust system. It's only 4.5" at the turbo.

    There are three types of Downpipe inputs (the part that attaches to the turbo).
    1. Bellmouth (4.5")
    2. Divorced (4.5" or 3" + 2")
    3. Non-bellmouth (3" pipe)

    Here is Invidia's explanation on JCSpeeds' website
    Divorced vs. Bellmouth:
    Divorced: A divorced wastegate downpipe has a plate the protrudes into the turbo to separate exhaust flow coming out of the turbo to give reduce turbulence. This is good for stock and smaller turbochargers; the protrusion does not work with some aftermarket turbos (i.e APS).
    Bellmouth: This design has a wide-open bell at the turbo, which is better for larger turbochargers with more flow. It will work fine with a stock or small turbo, but it is designed for scenarios where wastegate turbulence is not an issue.

    The diagram to the right is a stock WRX turbo, so you can see how the turbocharger interacts with the Bellmouth and Divorced Invidia downpipe designs.
    This thread has pictures of the Non-bellmouth type.
    Engine Performance FAQ [[[READ ME]]]

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    Registered User 2:43AM's Avatar
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    Quote Originally Posted by DUB View Post
    Stop posting immediately.
    Haha, just listen up!

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