How much power would a catless UP pipe add?
Results 1 to 9 of 9

This is a discussion on How much power would a catless UP pipe add? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; I have a mainly stock 2003 WRX with the exception of an HKS Catback, HKS BOV, and an AEM intake. ...

  1. #1
    Registered User
    Join Date
    Oct 2012
    Location
    Phoenix, AZ
    Posts
    24

    How much power would a catless UP pipe add?

    I have a mainly stock 2003 WRX with the exception of an HKS Catback, HKS BOV, and an AEM intake. Im wondering how much power a Catless Up pipe would add. Thanks

  2. Remove Advertisements
    ClubWRX.net
    Advertisements
     

  3. #2
    and the Funky Bunch Calvinball's Avatar
    Join Date
    Jan 2012
    Location
    Philly Area
    Posts
    5,926
    My understanding is that it won't really be adding power, but you will get a little quicker spool on the turbo. Most importantly though, those earlier models want a catless uppipe because there is a possibility of the cat itself breaking up and therefore shooting bits into the turbo, thus ruining it.

    I'm sure someone who isn't a silly 3rd gen owner will come in and clarify more.
    - Will
    First Mods: What to do and what not to do
    Current Car: 2014 Golf TDI
    Previous Cars:2012 WRB WRX Hatch, 2004 RSX-S, 1998 Grand Prix GTP
    "Isn't it amazing how smart you feel when you just aren't being stupid?"

  4. #3
    Registered User
    Join Date
    Oct 2012
    Location
    Phoenix, AZ
    Posts
    24
    Alright thanks. Because i want to eventually do a 20g turbo upgrade. And i hear with that you have to do some other mods as well (catless Up, 3inch exhaust, injectors, etc)

  5. #4
    and the Funky Bunch Calvinball's Avatar
    Join Date
    Jan 2012
    Location
    Philly Area
    Posts
    5,926
    Quote Originally Posted by DoubleM_95 View Post
    Alright thanks. Because i want to eventually do a 20g turbo upgrade. And i hear with that you have to do some other mods as well (catless Up, 3inch exhaust, injectors, etc)
    Definitely. And here is where I fully and respectfully bow out of the advice giving, as there are others on the board far more qualified to discuss all that. I do know that you definitely don't want the stock uppipe on there if you are going to be modifying like that.
    - Will
    First Mods: What to do and what not to do
    Current Car: 2014 Golf TDI
    Previous Cars:2012 WRB WRX Hatch, 2004 RSX-S, 1998 Grand Prix GTP
    "Isn't it amazing how smart you feel when you just aren't being stupid?"

  6. #5
    Registered User Ruh Roh's Avatar
    Join Date
    Dec 2011
    Location
    Pottstown PA
    Posts
    3,229
    for a 20g or any turbo upgrade the stock uppipe will need to be replaced. Why a 20g? what whp are u aiming for? also are you running a tune? if not put the stock airfilter back on and take the bov off as well. you can reuse them in your build but now isnt the time unless tuned for the intake

  7. #6
    He simply abides. SD_GR's Avatar
    Join Date
    Jul 2002
    Location
    CA, US
    Posts
    22,317
    I Support ClubWRX
    You could sell the intake and BOV to finance an up pipe and the required gaskets, studs (it's an older car), and bandages. Also buy a resistor; search "resistor CEL fix" for info.

    See how you like the car, and then consider getting only what's necessary for you to like the car a bit more each time. A 20G involves a lot of time and expense for an aging car.

    Just IMO.
    WRX Info Links, Courtesy TheJ
    The world breaks everyone and afterward many are strong in the broken places. Ernest Hemingway
    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
    DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

  8. #7
    Subaru Newb MainFrame's Avatar
    Join Date
    Sep 2002
    Location
    Texas, United States
    Posts
    7,944
    I Support ClubWRX I Support ClubWRX
    From the butt dyno, I would say catless uppipe provided a considerable gain in torque, with just a minimal horsepower gain.

  9. #8
    Registered User
    Join Date
    Oct 2012
    Location
    Phoenix, AZ
    Posts
    24
    Quote Originally Posted by Ruh Roh View Post
    for a 20g or any turbo upgrade the stock uppipe will need to be replaced. Why a 20g? what whp are u aiming for? also are you running a tune? if not put the stock airfilter back on and take the bov off as well. you can reuse them in your build but now isnt the time unless tuned for the intake
    My goal is around 260-300 whp for now.

  10. #9
    Registered User sxcrxy's Avatar
    Join Date
    Nov 2011
    Posts
    233
    Quote Originally Posted by DoubleM_95 View Post
    My goal is around 260-300 whp for now.
    1stly get rid of your bov if you want sound get at lease a 50/50 bov to keep your ecu happy

    secondly you have a intake + bov and not mention anything about a tune? you want power its all in the tune and running these item without a tune is like a time bomb ticking

    i hit 300whp on a td05 big 16g, @ 22psi a vf34 will probs get you into the 280whp range and not have anywhere near as much lag as you will with a 20g oh and if your going to run a 20g you could probly get more than 300whp but how much can your stock internals take? how is your compression levels? i say you should read some more threads on turbos and mods but yes you will see good gains with a better up pipe

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •