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Product Media
COBB Tuning Downpipe Catted Bellmouth - Subaru WRX 2008-2014 / STI 2008+ / Forester XT 2009-2013
COBB Tuning Downpipe Catted Bellmouth - Subaru WRX 2008-2014 / STI 2008+ / Forester XT 2009-2013
COBB Tuning Downpipe Catted Bellmouth - Subaru WRX 2008-2014 / STI 2008+ / Forester XT 2009-2013
COBB Tuning Downpipe Catted Bellmouth - Subaru WRX 2008-2014 / STI 2008+ / Forester XT 2009-2013
COBB Tuning Downpipe Catted Bellmouth - Subaru WRX 2008-2014 / STI 2008+ / Forester XT 2009-2013
COBB Tuning Downpipe Catted Bellmouth - Subaru WRX 2008-2014 / STI 2008+ / Forester XT 2009-2013
Community Media
User Media for: COBB Tuning Downpipe Catted Bellmouth - Subaru WRX 2008-2014 / STI 2008+ / Forester XT 2009-2013
User Media for: COBB Tuning Downpipe Catted Bellmouth - Subaru WRX 2008-2014 / STI 2008+ / Forester XT 2009-2013
User Media for: COBB Tuning Downpipe Catted Bellmouth - Subaru WRX 2008-2014 / STI 2008+ / Forester XT 2009-2013

COBB Tuning Downpipe Catted Bellmouth

Subaru WRX 2008-2014 / STI 2008+ / Forester XT 2009-2013

Features & Product Details

RallySport Direct is proud to provide you with quality performance and racing products brought to you by COBB Tuning. 

On this page, you are looking at the COBB Tuning Catted Bellmouth Downpipe. This is a great upgrade because it combines smooth bends and a larger piping diameter which will result in an improved throttle response, reduced turbo lag, increase in both horsepower and torque, all while providing an aggressive exhaust note.

Here are the key features:

  • CAD designed
  • Single 400-grade stainless steel high-flow catalytic converter
  • 304 Stainless steel construction
  • 3" piping diameter
  • Tapers to a 2.5" stock flange
  • Factory style 02 sensor provision
  • Note that this downpipe will require a tune to maximize the full performance potential. 

    Product Video

    Specifications

    Brand: COBB Tuning
    Includes Catalytic Converter: Yes
    Installation Hardware Included: No
    Mouth Design: Bellmouth
    Piping Coating: No
    Piping Flex Joint: No
    Piping ID: 3.00in
    Piping Material: 304 Stainless Steel
    Piping Taper: Yes
    Tuning Required: Yes
    Mfgr. Warranty: 1 Year
    Condition: New Product
    Return Policy:

    RallySport Guarantee - 30 Days


    Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

    RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

    The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
    RallySport Guarantee
    WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    PEOPLE WHO VIEWED THIS ITEM ALSO VIEWED

    REVIEWS & CUSTOMER MEDIA

    28 Reviews
    4.9 out of 5 Stars
    5 Stars
    (24)
    4 Stars
    (4)
    3 Stars
    (0)
    2 Stars
    (0)
    1 Stars
    (0)
    Customer Photos and Videos
    COBB Tuning Downpipe Catted Bellmouth ( Part Number: 524203)
    COBB Tuning Downpipe Catted Bellmouth ( Part Number: 524203)
    COBB Tuning Downpipe Catted Bellmouth ( Part Number: 524203)
    0 of 1 people found the following review helpful
    Honest Review 9 months ago
    4out of 5stars

    I installed this downpipe in one day without much hassle. After flashing on the new cobb tune the car runs better than ever and is a joy to drive. However, for the price of this part, I would have expected it to also come with the appropriate hardware and instead, I now have a plastic license plate frame to match. P.S. You will need to purchase a new O2 sensor with a longer cable.
      
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    2 of 2 people found the following review helpful
    Best possible bolt-on upgrade for your STI 10 months ago
    5out of 5stars

    I installed the COBB downpipe on my 2018 STI this weekend. It took two people about two hours to install with a lift. Keep in mind we were not rushing by any means and took our sweet time chatting during the install. I'd have to say the most difficult part of the entire process was removing the OEM heat shield. Some of the bolts require some finagling to remove. As another reviewer mentioned, the downstream O2 sensor barely reaches the harness. You won't be able to mount the sensor wire in the same orientation as you found it before the install. As far as performance goes.....wow! If you are looking for astronomical peak torque, this is not the product for you. The downpipe shifts the torque curve down in rpm and raises the slope. In other words the drive-ability drastically improves and the torque comes on much quicker and pulls extremely hard. The exhaust note changes very aggressively too, but I also have the HKS Hi-power dual exit exhaust. There is much more of a rasp/growl now when the boost kicks in. In my opinion this upgrade is a no-brainer and the STI should have come from the factory like this. Don't forget to put the COBB stage 2 tune in before starting the vehicle. Something else that isn't mentioned anywhere to my knowledge is that the car needs to relearn it's idle after reflashing the ECM. Rule of thumb from what I have found and also reinforced by my tuner is about 20 minutes after startup. Upgrade and don't look back. I assure you I haven't steered you in the wrong direction
      
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    Best bang 4 for buck upgrade 2 years ago
    5out of 5stars

    This does 4 great things: 1. reduce weight by 11 lbs from OEM 2 . Increase HP ( with Cobb stage 2 tune) 3. Increase low end Torque ( with Cobb stage 2 tune) 4. Adds Subi Rumble ( no heat rapping. ) if you want it quiet like stock, just wrap the first top by 1.5ft. Best Upgrade of all on my 2008 WRX other than having Limited Slip rear. Can Swap this out for Stock DP in 30 minutes. down this 2 times now and no issues. My Favorite for $600. Definitely better this than a Cat back system, witch yields very small improvement. A++
      
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    1 of 2 people found the following review helpful
    I hate Cobb, but... 2 years ago
    5out of 5stars

    I'm not a fan of Cobb as a brand, or the stereotype wrx people who love it so much, but this is one of the only bell mouth downpipes that comes with cats at the proper end and a premade port for a wideband to plug in. Excellent construction and fitment, and hooks up to my Blouch Dominator 2.5XTR beautifully. Excellent downpipe.
      
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    2012 STI-Cobb’s down pipe  2 years ago
    5out of 5stars

    The removal and install was no challenge at all. Some penetrating oil, basic tools and a couple jack stands are all you need. Make sure to get new hardware(turbo-exhaust bolts+nuts and gaskets for both ends) I also used molyB because I like to be extra.
      
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    QUESTIONS & ANSWERS

    • Q: Cobb downpipe 2011 sti  Gunner7072 months ago

      Read in the reviews that you will need longer o2 sensor to connect to the downpipe, 1. do I need to buy a new sensor for this? 2. Where can I purchase said extended o2 sensor
    • Q: O2 bung  $teveMac3 months ago

      Can you confirm if the 02 sensor bung is pre-cat or post-cat? The original downpipe used to be pre-cat, however the images show post-cat now.
    • Q: O2 bung  $teveMac4 months ago

      Why has it been relocated? The older components had the bung pre-cat.
    • Q: 2018 STI   JL4 months ago

      I have a borla exhaust and was wondering if this downpipe will mate to it with the stock gasket. Thank you for your time.
      • 0 of 0 people found the following answer helpful

        A:  The stock gasket will line up with this downpipe, but I would recommend getting a new gasket with it to ensure there are no leaks.

        Travis D. @ RallySport Direct
          
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