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Invidia Q300 Cat Back Exhaust - Subaru WRX/STI 2002-2007
Invidia Q300 Cat Back Exhaust - Subaru WRX/STI 2002-2007
Invidia Q300 Cat Back Exhaust - Subaru WRX/STI 2002-2007
Invidia Q300 Cat Back Exhaust - Subaru WRX/STI 2002-2007
Invidia Q300 Cat Back Exhaust - Subaru WRX/STI 2002-2007
Invidia Q300 Cat Back Exhaust - Subaru WRX/STI 2002-2007
Invidia Q300 Cat Back Exhaust - Subaru WRX/STI 2002-2007
Invidia Q300 Cat Back Exhaust - Subaru WRX/STI 2002-2007
Invidia Q300 Cat Back Exhaust - Subaru WRX/STI 2002-2007
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User Media for: Invidia Q300 Cat Back Exhaust - Subaru WRX/STI 2002-2007

Invidia Q300 Cat Back Exhaust

Subaru WRX/STI 2002-2007

Read 24 Reviews | 23 Q&As
Part # HS02SW1G3S
msrp: $1,040.00

Ships within 22 days

Features & Product Details

RallySport Direct proudly carries a large selection of quality high-performance master-crafted exhaust options brought to you by Invidia. 


This is the Invidia Q300 Cat-Back Exhaust System. The Q300 is a highly coveted exhaust system among enthusiasts because it gives them everything they want in terms of a performance upgrade. You get premium fabrication using quality materials that are combined with machined welds. The design features very smooth radius bends with an increase in piping diameter to allow for an unobstructed flow path for the exhaust to escape. And the beautiful polished finish right out of the box will check all the aesthetic boxes to provide the rear of your vehicle with a pronounced look. The final result will provide the user with a nice increase in power and torque, and improvements in the throttle response. The most rewarding aspect is the race-inspired sound. From mild bolt-ons to full builds, the Invidia Q300 will change the character of your vehicle to make your driving experience much more enjoyable. 





  • 304 stainless steel construction
  • 76mm piping diameter
  • Single-exit design
  • Cast flanges
  • Premium machined welds
  • 101mm polished stainless tip
  • Smooth bends allow for an unobstructed exit path
  • Improves horsepower and torque
  • Improves the throttle response
  • Reduces the turbo lag
  • Saves weight
  • Creates a race-inspired exhaust note
  • Exhaust hangers welded onto the OEM locations to make for a direct fitment
  • Includes gaskets and hardware to make this exhaust ready for the installation


    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: 1
    Tip Shape: Round
    Tip Size: 101mm
    Mfgr. Warranty: 1 year
    Condition: New Product
    Return Policy:



    24 Reviews
    4.8 out of 5 Stars
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
    Customer Photos and Videos
    Invidia Q300 Cat Back Exhaust ( Part Number: HS02SW1G3S)
    05 WRX Wagon - Great exhaust, mild sound 9 months ago
    5out of 5stars

    Just installed this on my 05 WRX Wagon. I was looking for a stock replacement that’s a bit more fee flowing and not too loud. This fit the bill. Zero rasp but good meaty sound. You can hear it from the cab but it’s not very loud and the idle is just a hair louder than stock. I’m waiting on the Grimmspeed coupler but the exhaust fit well enough on the stock donut gasket for a temporary fit. I’d be careful about how tight you torque it though, to not gouge the gasket since you’ll be using it later. One complaint, the bolts that came with the exhaust are too large to attach to the cat. I had to use M8 bolts to attach and the exhaust comes with M10 bolts. Great overall
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    Perfect 11 months ago
    5out of 5stars

    I have owned a few different exhausts for my 07 WRX, but this one is my favorite. (I’m getting old too, so might have to do with it). Fitment is perfect, might want to grab some long and short hangers though to play with the height. But sound is amazing. I had the N1 with resonator before, it was loud, good loud, but too loud. This Q300 though, it’s almost the same level at idle and low RPM, but it doesn’t “scream” like the N1 when you get into high RPM, it’s more civil. After 4K RPM on N1, I felt like everyone thought I was trying to race. This is still plenty loud enough for me, just Mature and not as raspy. No change in noticeable performance. Think I still like the look of N1 slightly more. The tip is the same size though too, wouldn’t guess from pics.
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    Perfect sounding exhaust! 1 year ago
    5out of 5stars

    I have this installed on my 2000 Subaru 2.5rs and it fits perfectly using most of the existing hanger brackets with the longer Kartboy polyurethane exhaust hangers. I had to also get an adapter and a new donut gasket to mate it with my Cobb downpipe. The sound is exactly what I was looking for and does not have an obnoxious drone from inside. It's quiet when the car is idling and does not bother my neighbors when I leave for work early in the morning. However, when you want to unleash the beast, you can definitely hear that infamous Subie rumble!
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    Invidia q300 exhaust 2 years ago
    5out of 5stars

    Easy to install. And sounds great a deep tone that doesnt drone. A great buy. I came from a invidia n1 race
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    2006 STI w/ETS rotated turbo kit 4 years ago
    5out of 5stars

    I did the install of this on my own. The two piece assembly made this very easy to get the pipe aligned while squeezing under my car. Exhaust came with all new gaskets and hardware. I purchased this to replace the custom made exhaust on my car (Needed something less quiet). It fitted up perfectly with my ETS rotated downpipe without issue. The tone is pleasant and made my mini monster less noticeable on the street. Being catless and having equal length headers, it still growls a bit. Once the wastegate opens, you can't hear this exhaust at all. Thank you Rally Sport Direct for the fast shipping over the last few years!
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    • Q: 2006 wrx wagon. Invidia q300  Ray 7 months ago

      Does this include gaskets and hardware for the 3 inch flanges? I know I'll need the adapter for the stock downpipe and donut gasket.
    • Q: Flow n1 vs q300  sprint200mm830021 year ago

      I have a 2006 sti with an ividia n1, i’m ready for something quiet. How much more restrictive is this exhaust? I’m running a fp blue on flex fuel, and am worried if it will be restrictive or need to be retuned. Running about 400whp on a mustang dyno.
      • 0 of 0 people found the following answer helpful

        A:  I doubt you would notice a difference at all. The dyno might measure a few HP loss, but in the real world, you would not be able to tell outside the reduction in noise of course. I say go for it and I think you'll be super happy with the way this sounds on a high HP car :)

        Rick C. @ RallySport Direct 1 year ago  
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    • Q: 2004 sti stock downpipe fitment  Jordan 1 year ago

      Will I need an adapter to bolt this to a stock 2004 sti downpipe?
    • Q: invidia q300  hans2 years ago

      Do you fuys know the decibel sound level on this set up?
    • Q: Invidia Catted Divorced downpipe  bmscone464773 years ago

      Will this catback bolt up to the invidia downpipe or do I need an adapter?