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This is a discussion on First STI within the New Member Hangout forums, part of the Community - Meet other Enthusiasts category; Originally Posted by camry man68 A bigger diameter cat back exhaust is good because it minimizes back pressure. Why would ...

  1. #16
    Registered User Timdog1650's Avatar
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    Quote Originally Posted by camry man68 View Post
    A bigger diameter cat back exhaust is good because it minimizes back pressure. Why would a throttle body and intake manifold not help the wrx?
    Because they are not choke points in the intake flow. You should only upgrade something if it isn't doing the job properly. In the case of the throttle body, it is the right size for most applications up to about 500bhp.

    The wrx intake manifold is notoriously uneven but so far there haven't been a lot of companies that have shown worthwhile gains that justify the $1500-3000 you would have to spend on a manifold. 5-10whp up top is not worth that kind of money. Not until you're in the 500bhp neighborhood does a sheet metal manifold start to show real potential.

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    Tons of good info. Thanks to every one!!!! My list is looking good!

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    Registered User abhiwan's Avatar
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    Quote Originally Posted by camry man68 View Post
    A bigger diameter cat back exhaust is good because it minimizes back pressure. Why would a throttle body and intake manifold not help the wrx?
    a cbe will not realize any appreciable gains.The majority of backpressure is created by the downpipe, due to the 2 cat's. you will releave very little backpressure by replacing just the stock cbe.

    you can modify the stock intake manifold by removing the TGV's, this will increase flow.
    Last edited by abhiwan; 06-23-2008 at 04:54 AM. Reason: edited for miss information see above post
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    Master Baiter EJ257's Avatar
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    Quote Originally Posted by abhiwan
    you can modify the stock intake manifold by removing the TGV's, this will increase flow, but even this will not be worth the hassle unless you have a larger turbo.
    PnP exhaust manifold + better crossover pipe, TGV-delete, PnP Intake manifold

    You can get all that done for ~ $800 + install and it will improve the flow pre-turbo

    You can get 5-10hp/10-15tq by doing the TGV deletes alone with a StageII car:
    Last edited by EJ257; 06-23-2008 at 04:47 AM.
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  6. #20
    Registered User abhiwan's Avatar
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    Quote Originally Posted by idipskoalmint View Post
    PnP exhaust manifold + better crossover pipe, TGV-delete, PnP Intake manifold

    You can get all that done for ~ $800 + install and it will improve the flow pre-turbo

    You can get 5-10hp/10-15tq by doing the TGV deletes alone with a StageII car:
    i stand corrected I edited my post accordingly.
    Last edited by abhiwan; 06-23-2008 at 04:55 AM.
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