05 STi power gains
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This is a discussion on 05 STi power gains within the New Member Hangout forums, part of the Community - Meet other Enthusiasts category; Hey everyone, I should be buying an 05 STi in a week or two. I'm overseas in the desert right ...

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    05 STi power gains

    Hey everyone, I should be buying an 05 STi in a week or two. I'm overseas in the desert right now, so hopefully I'll be back in a week or two. Not new to the whole forum thing, so I did try searching.

    I don't plan on doing too much in the way of mods, except for probably a turbo back exhaust and maybe something along the lines of accessport.

    Now to my nOOb questions. I was thinking of getting a perrin downpipe and perrin catback exhaust. But what kind of power gains would I most likely see? And if I go stage 2, what gains would that yeild?

    Thanks

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    Registered User BlkWRXWag's Avatar
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    www.cobbtuning.com - they have the numbers there.
    -Max.

    06 STU STI
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    Registered User Wrx BriT's Avatar
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    Welcome to the club. You will be looking at 350hp at the crank.

    Sn
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    Is that the rating for just the turbo back exhaust? Or is that with cobb stage 2? How much horsepower is that at the wheels?
    Damn the nOOb questions just keep on coming. And lastly would I be fine with just a turbo back exhaust, or would it be better
    to go completely stage 2? Performance wise.
    Last edited by Clos23; 03-07-2006 at 06:07 PM.

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    Registered User TOOFAST88's Avatar
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    That's the STG2 numbers. That will probably be about 280-290 awhp. Idealy you should go with the reflash not just the tbe.
    COBBS!.....We got COBBS everywhere meng! COBBS, COBBS, COBBS!
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    So about how much would the whp be with just a downpipe and catback exhaust? Are there any negative effects just running those two, like poor idleing, backfiring, etc.? I don't really wanna mess with my warranty too much, so that's why i'm hesitant to get accessport stage 2.

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    Registered User Wrx BriT's Avatar
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    Quote Originally Posted by Clos23
    Is that the rating for just the turbo back exhaust? Or is that with cobb stage 2? How much horsepower is that at the wheels?
    Damn the nOOb questions just keep on coming. And lastly would I be fine with just a turbo back exhaust, or would it be better
    to go completely stage 2? Performance wise.
    Thats with a stage 2 reflash. With 15% (I think) drivetrain loss it would it would be around 300 whp.

    I'm waiting for someone who has a stage 2
    sti to chime in.

    Sn
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    RSTi Swap FTW
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    Registered User TOOFAST88's Avatar
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    You really shouldn't have any problems with a turbo-back exhaust, but you definitely won't be pushing it to its potential w/o some sort of tune. As of now, dealers cannot detect a stage two reflash. In any case, if you're that worried you can always revert to stock or unmarry the ap if you choose.
    COBBS!.....We got COBBS everywhere meng! COBBS, COBBS, COBBS!
    Blobeye Syndicate #2
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    Quote Originally Posted by StreetSlider
    Hellen Keller's favorite color is Blobeye Syndicate.

  10. #9
    Registered User TOOFAST88's Avatar
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    Quote Originally Posted by Wrx BriT
    Thats with a stage 2 reflash. With 15% (I think) drivetrain loss it would it would be around 300 whp.

    I'm waiting for someone who has a stage 2
    sti to chime in.
    Yeah, those number sound good as well. I was assuming a high drivetrain loss of about 20%.
    COBBS!.....We got COBBS everywhere meng! COBBS, COBBS, COBBS!
    Blobeye Syndicate #2
    RYB - 01
    "RALLY ON"

    Quote Originally Posted by StreetSlider
    Hellen Keller's favorite color is Blobeye Syndicate.

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    Quote Originally Posted by TOOFAST88
    You really shouldn't have any problems with a turbo-back exhaust, but you definitely won't be pushing it to its potential w/o some sort of tune. As of now, dealers cannot detect a stage two reflash. In any case, if you're that worried you can always revert to stock or unmarry the ap if you choose.
    I guess that's true. I'm not really looking to get the max whp I can possibly get. Just a little extra kick to what a stock STi puts out. But if that's true that dealers cannot detect a reflash, I may have to reconsider. I read something about the gains on a stock STi with either just a downpipe or a downpipe and catback exhaust were negligable. Is that true? I'll post up the thread's link in second.

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    Quote Originally Posted by Clos23
    I read something about the gains on a stock STi with either just a downpipe or a downpipe and catback exhaust were negligable. Is that true? I'll post up the thread's link in second.

    Cobb stage 2

    It's the very last post. Not sure if I misunderstood what he said.

  13. #12
    Registered User TOOFAST88's Avatar
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    The downpipe is the most restrictive part of the exhaust system; therefore if you replace the downpipe it will yield the most gains. There's also another cat in the mid pipe. You could get downpipe and keep the rest stock, but theres still maybe 10hp to be gained with the cat-back, not to mention the sound.
    COBBS!.....We got COBBS everywhere meng! COBBS, COBBS, COBBS!
    Blobeye Syndicate #2
    RYB - 01
    "RALLY ON"

    Quote Originally Posted by StreetSlider
    Hellen Keller's favorite color is Blobeye Syndicate.

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    That's cool then, I'm thinking I should get a dp first, then a catback. The only thing i'm wondering is if getting a catless dp, does that cause you to throw a cel?

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    Registered User TOOFAST88's Avatar
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    Yup, you can get a cell fix or purchase a resistor from radio shack for cheap. Or if you go with the AP it'll fix that for you.
    COBBS!.....We got COBBS everywhere meng! COBBS, COBBS, COBBS!
    Blobeye Syndicate #2
    RYB - 01
    "RALLY ON"

    Quote Originally Posted by StreetSlider
    Hellen Keller's favorite color is Blobeye Syndicate.

  16. #15
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    What's a resistor? Or the cel fix you're talking about?

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