Invidia Q300 Cat Back Exhaust

Part #: INV HS11STIG3S
( 32 reviews )


MSRP: $1,378.00


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Brand: Invidia
Exhaust Orientation: Straight Exit
Installation Hardware Included: Yes
Piping Coating: No
Piping Flex Joint: Yes
Piping ID: 76mm
Piping Material: 304 Stainless Steel
Piping Taper: No
Silencer Included: No
Tip Material: Stainless Steel
Tip Qty: 4
Tip Shape: Round
Tip Size: 110mm
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 Limited Sedan 2011, 2012, 2013, 2014WRX STI Sedan 2011, 2012, 2013, 2014WRX Limited Sedan 2011, 2012, 2013, 2014WRX Sedan 2011, 2012, 2013, 2014WRX Premium Sedan 2011, 2012, 2013, 2014

For a good balance of price and performance, Invidia Exhaust is constructed with high-quality SUS304 stainless steel, CNC-machined flanges, and manufactured with a polished finish. Each system features mandrel-bent stainless steel piping for maximum exhaust flow and reduced back pressure. These exhausts are engineered to produce strong mid to top-end power gains, as well as an increase in horsepower and torque.

This exhaust is for the 2011+ WRX/STI sedans ONLY. Will not fit the hatchback models.

REVIEWS ( 32 )


Verified Purchase
Invidia Q300 on 14wrx
ringa 6 days ago
Great exhaust. Replaced a SPT cat back. Volume is about the same with none of the headache inducing drone of the SPT. I did have the issue of the ends sitting to close the bumper with kartboy standard length exhaust hangers. Picked up a set of Cusco HD Exhaust Hangers, part number A160 RM002B. The hanger hole distance of the cuscos is 40mm, Kartboy is 35mm. The extra 5mm made the exhaust hang perfect. I did notice rallysport has the dimensions of the cuscos listed wrong.
Verified Purchase
Best Xmas Gift
his queen bae 11 days ago
bought this for my bf and he loves it ! Installation was quick and easy, he did it within 20 mins. the sound is amazing ! we both hear and feel the difference. I would recommend this product for sure !

Q300 on '13 sti sedan
sitiriche88933 1 month ago
Aggressive boxer sound when you floor it, same sound as stock when cruising. Perfect combination. Great look, easy to install. Currently installed with cobb intake and cobb downpipe.

Some things you should know before buying...
Hawkeye 3 months ago
Nicely built exhaust system, but the only thing people ever talk about is "drone." No one has talked about other issues with this exhaust that buyers should be aware of. Such as the fact that this Q300 system is lacking drone because it's more restrictive than other exhausts, like COBB for example, that are much more free flowing. This restriction in the muffler design causes great low end torque gains (on stage 2+ tunes) but really causes the power band to fall flat and plateau at around 5,000-7,000 RPM so there's very little top end performance. Additionally, this exhaust system is NOT very loud. It's just a little louder than stock. So for people looking for a loud and "in-your-face"exhaust, this is not the one you would want to buy. Hope this helps future buyers make the right decision.

5/5 would do again
jshclry92 9 months ago
sweet sound on my 13' wrx sedan...good tone, not obnoxiously loud either. feel like it helped my stage 1 tune most in the mid-upper rpm band to edge out a little more power.


  • AnswerQ: fitment   Dave102 1 month ago

    Hi, Will the Q300 fit Australian model wrx 2012? Being right hand drive any other requirements needed for fitment? Thanks

    • A: Unfortunately, we can only confirm fitment for USDM vehicles. Sorry for any inconvenience!

      Brady R 1 month ago

  • AnswerQ: Fitment with Invidia Catless DP.  Luis Pelaez 1 year ago

    hello at this time my 13 STI has a Invidia Catless DP with SPT exhaust and I am very interested on this q300. Will it match the Catless DP or I still need to use the adapter?

    • A: Yes, this will bolt right up to your Invidia Catless Downpipe

      Brady R. 1 year ago

  • AnswerQ: replacement gaskets  dhaggerty6715217136 1 year ago

    Where can I find replacement gaskets and bolts for the cat this cat back ?

    • A: You can use generic bolts from a local hardware store and we recommend coated or stainless steel hardware. The hardware specifications are below. M10 x 1.25 Bolt & Nuts x 6 M8 x 1.25 Bolt & Nuts x 2 The recommended replacement gasket part numbers are below. GRM 022001 Or RMF RF8006 GRM 020031 You will need two of each gasket if you want to replace all of them.

      Zach G. 1 year ago

  • AnswerQ: Stock down pipe to mid pipe  c.sanborn9017956 1 year ago

    Do I need any adapters to bolt up to stock down pipe on '13 wrx sedan?

    • A: An adapter is not necessary, but you can use your donut gasket and adapter # GRM 077046 to make for an easier install

      Brady R. 1 year ago

  • AnswerQ: Hardware   captain_boost 2 years ago

    What size are the bolts that come with this? I lost mine

    • A: M10 x 1.25 Bolt & Nuts x 6 M8 x 1.25 Bolt & Nuts x 2

      Zach G. 2 years ago