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COBB Tuning Downpipe Catted Bellmouth (Part Number: )
COBB Tuning Downpipe Catted Bellmouth (Part Number: )
COBB Tuning Downpipe Catted Bellmouth (Part Number: )
COBB Tuning Downpipe Catted Bellmouth (Part Number: )
COBB Tuning Downpipe Catted Bellmouth (Part Number: )
COBB Tuning Downpipe Catted Bellmouth (Part Number: )
Community Media
COBB Tuning Downpipe Catted Bellmouth (Part Number: )
COBB Tuning Downpipe Catted Bellmouth (Part Number: )
COBB Tuning Downpipe Catted Bellmouth
Subaru WRX 2008-2014 / STI 2008+ / Forester XT 2009-2013
Read 21 Reviews | 53 Q&As
Part # 524203
$595.00

In stock! Ships same day

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. 

    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: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.

    PEOPLE WHO VIEWED THIS ITEM ALSO VIEWED

    REVIEWS & CUSTOMER MEDIA

    21 Reviews
    4.9 out of 5 Stars
    5 Stars
    (18)
    4 Stars
    (3)
    3 Stars
    (0)
    2 Stars
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    Customer Photos and Videos
    COBB Tuning Downpipe Catted Bellmouth ( Part Number: 524203)
    COBB Tuning Downpipe Catted Bellmouth ( Part Number: 524203)
    Good quality! 2 days ago
    Qrz
    Installed the COBB down pipe along with the Invidia Q300 catback exhaust, tuned with COBB accessport stage 2+ SF. Took a little time to find all the screws to the stock heat shield. Other than that everything else was pretty straight forward. Loving the sound and performance of the new exhaust. Definitely recommend this product.
      
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    1 of 1 people found the following review helpful
    Downpipe overview  4 months ago
    Wrx2014hatch
    When first pulling it out of the box you can really see the craftmanship that went into making it the price it is, and why it’s a high seller. When comparing it to the stock downpipe you can really see how much the stock one restricts the flow. The diameter is significantly bigger, and the material and quality is far more. The install process takes time, but isn’t frustrating as long as you have the proper tools and setup for the job. I’d definitely recommend buying extra screws however, gasket, donut ring. You can definitely hear a change in the tone(deeper) and throatiness compared to having just a catback(Cobb) setup. It’s not much louder, but does give it a slight increase in the two I just mentioned. It sounds great when you really get on it, and gives off more pops when both up and down shifting. When flashing to the stage two tune you can definitely see a performance gain as it pulls harder in each gear and puts down more boost. I really enjoyed the car a lot more around twisty hilly roads. The power was there when you needed it. I’d say it’s well worth the upgrade
      
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    Great product 4 months ago
    Bill Nye the STI guy
    This downpipe is really nice. I got a recommendation from my tuner at first because I was not too familiar with the pros and cons of bellmouth downpipes vs divorced wastegate downpipes, and still being on the factory turbo with the internal wastegate, I opted to go with the bellmouth style. I added this along with an Invidia N1 Race catback, and I must say I'm loving the sound. Not raspy at all, and has a nice deep rumble. You can even hear the turbo in the exhaust as well. Not only that, but having had the Cobb SF intake and airbox already, I feel like this added a little extra BPV noise. Having switched from the stage 1+ map to the stage 2+ map, I have seen an improvement of over .3 seconds in trap times in the quarter mile, and feel a very nice improvement in power and torque. Overall install was easy. The worst part is fighting with rubber exhaust hangers. But after a little soapy water, everything hooks up easy. Fitment is perfect, and the only bit of advice I have is dont forget to re-torque the exhaust bolts after it's been driven. Oh. And another thing, when the other reviews say that the factory downpipe is restrictive, thats an understatement. This downpipe is very obviously less restrictive to the naked eye, and has a very nice increase in pipe diameter. I would also just recommend to purchase a new turbo - to - downpipe gasket as well, because when i took mine off it was obviously worse for wear. But yeah. 100% recommend this Cobb Catted Bellmouth Downpipe.
      
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    Great product 4 months ago
    Bill Nye the STI guy
    This downpipe is really nice. I got a recommendation from my tuner at first because I was not too familiar with the pros and cons of bellmouth downpipes vs divorced wastegate downpipes, and still being on the factory turbo with the internal wastegate, I opted to go with the bellmouth style. I added this along with an Invidia N1 Race catback, and I must say I'm loving the sound. Not raspy at all, and has a nice deep rumble. You can even hear the turbo in the exhaust as well. Not only that, but having had the Cobb SF intake and airbox already, I feel like this added a little extra BPV noise. Having switched from the stage 1+ map to the stage 2+ map, I have seen an improvement of over .3 seconds in trap times in the quarter mile, and feel a very nice improvement in power and torque. Overall install was easy. The worst part is fighting with rubber exhaust hangers. But after a little soapy water, everything hooks up easy. Fitment is perfect, and the only bit of advice I have is dont forget to re-torque the exhaust bolts after it's been driven. Oh. And another thing, when the other reviews say that the factory downpipe is restrictive, thats an understatement. This downpipe is very obviously less restrictive to the naked eye, and has a very nice increase in pipe diameter. I would also just recommend to purchase a new turbo - to - downpipe gasket as well, because when i took mine off it was obviously worse for wear. But yeah. 100% recommend this Cobb Catted Bellmouth Downpipe.
      
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    Instant powah! 6 months ago
    Twobicycle
    This is probably the best thing i have done to my car besides the AP. The stock DP is highly restrictive and this pipe with the Grimmspeed heat-shield went in easy as hell. I am currently running the DP to my stock exhaust (besides the axel back exhaust) and loving every dollar i spent. Highly recommend this to everyone.
      
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    QUESTIONS & ANSWERS

    • Q: Cobb downpipe to a tomei   Melvin sti5 days ago

      I have a 2011 Sti has a Cobb downpipe how do I make the tomei fit with no leaks?? Any help?
    • Q: Bolt up to Borla?  U.K.3 months ago

      I have a Borla Catback exhaust, specifically model number 140312. Would there be any issue bolting this up? Additionally, should I be entertaining a stage 2 clutch at this point? I also have the Cobb SF intake and accessport with stage 1+ tuning.
      • 0 of 0 people found the following answer helpful

        A:  Unfortunately, you would need an adapter, and you should not need to upgrade your clutch.

        Devan M. @ RallySport Direct 3 months ago  
          
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      • 0 of 0 people found the following answer helpful

        A:  Should I use the Invidia instead? Or would that need an adapter, too? Is this adapter something a standard exhaust shop would have?

        U.K. @
          
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    • Q: Fitment  Dominus3 months ago

      Hi will this Cobb Dp mate with the fujitsubo 2.75" catback? If not which dp will fit?
      • 0 of 0 people found the following answer helpful

        A:  The downpipe tapers down to a 2.5" so it will not fit and unfortunately, we do not sell a downpipe with 2.75" diameter.

        Devan M. @ RallySport Direct 3 months ago  
          
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    • Q: Fitment  Sti22773 months ago

      Does it fit a nameless catback exhaust? Do I have to buy any gasket? If I do, what kind of a gasket should I buy? Does it require an upgrade of fuel injectors and fuel pump? BTW I have a 2018 Subaru STi
      • 0 of 0 people found the following answer helpful

        A:  We cannot confirm fitment on the catback to downpipe, therefore we cannot answer the rest of the questions.

        Devan M. @ RallySport Direct 3 months ago  
          
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    • Q: Cobb dp to invidia r400  G3 months ago

      Will the Cobb down pipe bolt up to the invidia r400?
      • 0 of 0 people found the following answer helpful

        A:  They will bolt up, but since the Cobb uses an OEM style flange, you'll want to use a OEM downpipe to 3 inch catback adapter to prevent exhaust leaks.

        Marcus E. @ RallySport Direct 3 months ago  
          
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