Invidia Downpipe Catted Divorced Wastegate w/ 2 Bungs

Part #: INV HS08SW1DOC
( 20 reviews )


MSRP: $793.00


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Brand: Invidia
Includes Catalytic Converter: Yes
Installation Hardware Included: Yes
Mouth Design: Divorced Wastegate
Piping Coating: No
Piping Flex Joint: No
Piping ID: 3.00in
Piping Material: 304 Stainless Steel
Piping Taper: No
Catalytic Converter Cell Count: 200
Mfgr. Warranty: 1 Year
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.


Subaru Impreza
WRX STI Hatchback 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX STI Special Edition Hatchback 2010WRX STI Limited Sedan 2011, 2012, 2013, 2014WRX STI Limited Hatchback 2011, 2012, 2013, 2014WRX STI Sedan 2011, 2012, 2013, 2014WRX Sedan 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX Hatchback 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX Premium Sedan 2010, 2011, 2012, 2013, 2014WRX Premium Hatchback 2010, 2011, 2012, 2013, 2014WRX Limited Sedan 2010, 2011, 2012, 2013, 2014WRX Limited Hatchback 2010, 2011, 2012, 2013, 20142.5 GT Sedan 2009, 20102.5 GT Hatchback 2009, 2010
Subaru Legacy
GT Limited 2005, 2007, 2008, 2009GT 2005, 2006GT spec.B 2006, 2007, 2008, 2009
Subaru Forester
XT 2009XT Limited 2009, 2010XT Premium 2010, 2011, 2012, 2013XT Touring 2011, 2012, 2013
Subaru Outback
XT 2005, 2006XT Limited 2005, 2007, 2008, 2009
Subaru WRX STI
Base 2015, 2016Launch Edition 2015Limited 2016

The Invidia Catted Downpipe features a Divorced Wastegate and cat, this will separate the exhaust gas exiting the downpipe, creating a smoother exhaust flow, thus resulting in more HP and Torque. All this while keeping the exhaust fumes clean and safe for the environment.

The downpipe is constructed of 304 stainless steel 3" mandrel bent tubing and bolts up to any stock replacement catback or stock unit. New Downpipe Gasket recommended for purchase with this downpipe.

This downpipe also has an extra oxygen sensor bung welded in so you can install a wideband oxygen sensor and keep the stock one intact. It comes with a plug installed so you don't have to worry about not having one.

REVIEWS ( 20 )


Verified Purchase
mason.merrill75769 7 days ago
I currently have this on my 09 WRX and going stage 2 was definitely worth it. Previous to installing this I had the invidia n1 catback and this greatly improved the sound and performance. I'd recommend this + the N1 + AccessPort.

Amazing is all i can say
Scooba steve 1 month ago
Got this downpipe today. Installed it in about 2 hours. The old downpipe is a pos so that was the longest part. Bolted up very nice installed the stage 2 ots map and the difference is night and day. Sounds amazing now so much better. A big step in speed and power. So satisfied with the quality of this product. If you are on the edge buy it you will not be disappointed.
Verified Purchase
Turbo back exhaust
Wrxasaurus 3 months ago
Easy install, sounds amazing and looks great too.
Verified Purchase
Subaru STI 2013 - Performance and Quality plus Sound
jeffreyvelez 6 months ago
When I started modding my car this was the second thing I bought after intake. I bought this DP with the Q300 exhaust. This DP give me a lot HP gain and car is pretty fast now after Pro-tune. I love the way I gain power with just this DP, Exhaust, intake and accesport. Sound, what can I tell I don't need radio anymore. Product is high quality and performance its incredible. I highly recommend it.

Verified Purchase
Great downpipe
306Scooby 8 months ago
Matched this downpipe with an invidia q300 system for stage 2. Significant increase in power with the appropriate items for stage 2. Highly recommend item. Comes with plug for bung or ( I used wideband O2) sensor.


  • AnswerQ: SPT  cfoulk12 1 month ago

    what gasket would fit best to fit the spt catback ?

    • A: You would need a 3" downpipe to stock catback adapter (part: GRM 077044).

      Tyler.G 1 month ago

  • AnswerQ: 2015 STI  Stephandoan 2 months ago

    I have everything stock except intake and access port, do I need any adapters or gaskets for this down pipe? Thanks!

    • A: You would need a 3" downpipe to stock catback adapter as well as a replacement donut gasket is recommended. This downpipe does not include the turbo to downpipe gasket so that is recommended. Another thing to consider would be the turbo heat shield, but the stock unit can be trimmed to fit around this bellmouth.

      Brady R 2 months ago

  • AnswerQ: Gaskets   thewhokidd03854 2 months ago

    I need replacement gaskets. ( 3") Can you give me model #s ? Preferably Grimmspeed of any available

    • A: As long as you are mating the downpipe to a 3 inch catback, the part numbers that you will need are: GRM 028001 and GRM 022001.

      Tyler.G 2 months ago

  • AnswerQ: Turbo to dp gasket.  Towers_sti 3 months ago

    Which gasket is need for the turbo to dp gasket, do I have to use an oem gasket or do I need an aftermarket one?

    • A: The OEM replacement as well as the aftermarket options will work with this downpipe.

      Evan M. 3 months ago

  • AnswerQ: Gaskets!  jabad978 3 months ago

    With purchasing this downpipe, I'm aware of needing to purchase a brand new gasket for turbo/downpipe but I'm wondering if i also have to purchase a new gasket from downpipe to an 3" aftermarket catback exhaust?? & would it be a donut gasket or regular exhaust gasket??

    • A: It will depend on the size of the midpipe flange on your catback exhaust. If it is a 3" flange, you can use the included 3" 2 bolt gasket. If your exhaust is stock or uses a 2.5" flange, then I recommend getting a 3" downpipe to stock catback adapter and a new donut gasket. This adapter helps prevent leaks and allows you to use the OEM donut gasket.

      Josh P. 3 months ago