Purchasing Downpipe for 08 STI-catted or catless? Overboosting?
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This is a discussion on Purchasing Downpipe for 08 STI-catted or catless? Overboosting? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Just wondering what everyones thoughts are on catted vs catless on stock snail. Is overboost/boostcreep a problem on the vf39's ...

  1. #1
    Registered User KenFerrari13's Avatar
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    Purchasing Downpipe for 08 STI-catted or catless? Boost Creep?

    Just wondering what everyones thoughts are on catted vs catless on stock snail. Is overboost/boostcreep a problem on the vf39's with a stage 2 tune. I have heard yes and no on other forums but wondering what my fellow clubbers think on it. Car will be road tuned with opensource. I heard that cold temps can cause creep and live in PA so that will be an issue if valid.

    Thanks for the help
    Ken
    Last edited by KenFerrari13; 03-19-2014 at 08:07 PM.

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    Ken,
    I have an 04 WRX that I am putting a new DP on and I have done a lot of research. I also live in PA. Depending what county you live in, you may want to have the cat in there to pass emissions. I am going with the Cobb with the high flow cat. If you have a visual inspection, you will need to have the cat there to pass. If you get the smog test, you will definitely need it. Sometimes the high flow cat won't pass inspection though. As far as boost creep goes...I'm not sure on that one. I hope this helps.
    That awkward moment when you realize that an energy drink company has a better space program than your country...

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    Registered User KenFerrari13's Avatar
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    Inspection is not an issue but thank you !!

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    Moderator Donkey's Avatar
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    08's don't have the VF39. They have a VF48. There would be an issue with using the factory BCS. I would switch to a 3-port. The boost creep issue is hit or miss.
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  6. #5
    Registered User KenFerrari13's Avatar
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    What would be the problem with the factory BCS. Assuming the aftermarket 3 port like a Grimmspeed unit would offer better control of boost?

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    Moderator Donkey's Avatar
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    It is a "bleed" type system where a 3-port can be configured as a "hold" type system. Yes,better boost control. In the end if boost creep becomes an issue the only way to actually resolve it will be an EWG or porting the Vf48's IWG.


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  8. #7
    Registered User Scooby_newbie's Avatar
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    I run a catted DP on my build. I am going to run a catless here soon to make more power (granted i am EWG). I have a few friends that run catless and use the COBB wastegate maps and they dont see boost creep.

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