Intake or Catback first?
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This is a discussion on Intake or Catback first? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Im buying a Cobb AP first but after what would be better to get an intake or catback exhaust? When ...

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    Registered User BEASTmode632's Avatar
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    Question Intake or Catback first?

    Im buying a Cobb AP first but after what would be better to get an intake or catback exhaust?

    When it comes to the intake is there a difference or reason either a CAI or short ram would be better than the other?

    And as far as the catback i am looking into the Invidia Racing Cat Back. Will it bolt right up to the stock midpipe and still work when i upgrade the midpipe/downpipe? or will i have to have some type of different flange?

    Im new to the Subaru world so i have a **** ton of questions. Thanks for any help i can get
    2010 Subaru Impreza WRX Hatch
    Mods : Yakima Roof Rack, Perrin catted DP, Perrin CAI, Perrin shifter bushings, Perrin AP stage 2, Ebay/Custom 3" cat back, carbon Subaru emblems, blacked out tail lights, Cobb STS, Raceland Coilovers

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    zax
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    Intake or Catback first?

    Neither will improve power output. In most cases, the intake will necessitate a tune to scale the MAF. As such, if it's sound you're after, the question has already been answered. Also, post your year/model; we're not psychic.
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    Registered User UEDan's Avatar
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    Then use the force and read his sig

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    neither. Start with the Cobb and a downpipe

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    Registered User BEASTmode632's Avatar
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    Quote Originally Posted by UEDan View Post
    Then use the force and read his sig
    Funny dude. Hahaha

    I know it will need a tune thats why i said i was getting te AP first. So what would be better for me to get after. If theres no power increase then what would be the point in ever moding the car? Im going to do as much as i can to the car im just simply seeing what people suggest i get first.
    2010 Subaru Impreza WRX Hatch
    Mods : Yakima Roof Rack, Perrin catted DP, Perrin CAI, Perrin shifter bushings, Perrin AP stage 2, Ebay/Custom 3" cat back, carbon Subaru emblems, blacked out tail lights, Cobb STS, Raceland Coilovers

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    Registered User BEASTmode632's Avatar
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    Quote Originally Posted by Mf645 View Post
    neither. Start with the Cobb and a downpipe
    I was reading that theres almost no point in going with a catted downpipe because theres still a chance of failing emisions testing. So i would go catless. Does the downpipe replace the midpipe also? I did find a few shorty product and what i was getting from it was it only replaced thefirst cat from the turbo and the full downpipe replaced both cats. Correct?
    2010 Subaru Impreza WRX Hatch
    Mods : Yakima Roof Rack, Perrin catted DP, Perrin CAI, Perrin shifter bushings, Perrin AP stage 2, Ebay/Custom 3" cat back, carbon Subaru emblems, blacked out tail lights, Cobb STS, Raceland Coilovers

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    zax
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    Intake or Catback first?

    Quote Originally Posted by UEDan View Post
    Then use the force and read his sig
    On tapatalk; no sigs visible

    Catted down pipe will reduce the tendency for boost creep, which is not easily dialed out with the VF52 (no WGA adjustment)
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    Registered User BEASTmode632's Avatar
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    What exactly is boost creep?
    2010 Subaru Impreza WRX Hatch
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    Captain James of the SS Impreza has gone down with the ship Drews's Avatar
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    Quote Originally Posted by BEASTmode632 View Post
    What exactly is boost creep?
    Bad.
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    Registered User mgmoehn's Avatar
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    So... Here is some short knowledge that I have learned ... being new to tuning subies as well:

    You already have a Cobb AP.. good start

    Intake: Makes you intake sound cool, can hear the turbo more... there ARE more gains from having a stage 1 or 2 with an intake as opposed to not having one.

    Short Ram - Works with FMIC setup if you are planning on upgrading your turbo and going that route
    CAI - Sits in fender well - no proof that it gets submerged in water driving in rain... and comes with a heat shield - I would recommend AEM

    Exhaust - Going DP and Stage 2 will net you the most gains right out of the gate. You need a DP to go stage 2 and cannot do it on intake alone. I would suspect that you will see more gains from having an intake included in your Stage 2 tune.

    If you want to JUST upgrade your catback - then there will be no power gain unless you tune for stage 1 completely stock.

    Hopefully that answers your question.... now post a pic of your ride
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    Registered User crash55's Avatar
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    It's also worth noting the COBB AP maps only support catted DPs. So if you are running OTS maps that's the way to go to ensure it's supported.
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    Registered User BEASTmode632's Avatar
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    Quote Originally Posted by mgmoehn View Post
    So... Here is some short knowledge that I have learned ... being new to tuning subies as well:

    You already have a Cobb AP.. good start

    Intake: Makes you intake sound cool, can hear the turbo more... there ARE more gains from having a stage 1 or 2 with an intake as opposed to not having one.

    Short Ram - Works with FMIC setup if you are planning on upgrading your turbo and going that route
    CAI - Sits in fender well - no proof that it gets submerged in water driving in rain... and comes with a heat shield - I would recommend AEM

    Exhaust - Going DP and Stage 2 will net you the most gains right out of the gate. You need a DP to go stage 2 and cannot do it on intake alone. I would suspect that you will see more gains from having an intake included in your Stage 2 tune.

    If you want to JUST upgrade your catback - then there will be no power gain unless you tune for stage 1 completely stock.

    Hopefully that answers your question.... now post a pic of your ride
    thanks man. that helps alot. i do plan on going bigger turbo eventually so your saying it would be pointless to go with cold air?

    i will be posting some pictures some time this week
    2010 Subaru Impreza WRX Hatch
    Mods : Yakima Roof Rack, Perrin catted DP, Perrin CAI, Perrin shifter bushings, Perrin AP stage 2, Ebay/Custom 3" cat back, carbon Subaru emblems, blacked out tail lights, Cobb STS, Raceland Coilovers

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    Registered User BEASTmode632's Avatar
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    Quote Originally Posted by crash55 View Post
    It's also worth noting the COBB AP maps only support catted DPs. So if you are running OTS maps that's the way to go to ensure it's supported.
    thats a bummer because ive heard that its still hard to pass inspections even with the highflow cats. i would rather go catless. and its cheaper. do you think it would really make that big of a difference or would be bad for the car even if i had a catless dp and used one of the OTS maps?
    2010 Subaru Impreza WRX Hatch
    Mods : Yakima Roof Rack, Perrin catted DP, Perrin CAI, Perrin shifter bushings, Perrin AP stage 2, Ebay/Custom 3" cat back, carbon Subaru emblems, blacked out tail lights, Cobb STS, Raceland Coilovers

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    Master Baiter EJ257's Avatar
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    Quote Originally Posted by BEASTmode632
    thats a bummer because ive heard that its still hard to pass inspections even with the highflow cats.
    The difficulty of inspection lies solely on what emission testing your state/municipality does.

    Quote Originally Posted by BEASTmode632
    i would rather go catless. and its cheaper. do you think it would really make that big of a difference or would be bad for the car even if i had a catless dp and used one of the OTS maps?
    Cobb maps don't support catless downpipes; you need to read the map notes more carefully, in the future.
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