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Invidia Q300 Cat Back Exhaust ( Part Number:INV HS08SW5GT3)

Invidia Q300 Cat Back Exhaust - Subaru WRX Hatchback 2008-2010

Manufacturer Part # HS08SW5GT3


MSRP: $971.00

Ships within 3-4 weeks
Qualifies for free shipping!


If you are looking for a great way to squeeze a little extra performance from your vehicle, then you will be pleased with the Invidia Q300 Cat Back Exhaust System. There are several performance attributes that makes this an excellent upgrade. This exhaust system has been made from 304 stainless steel and features 76MM piping. The exhaust has also been designed with minimal bends to reduce the amount of turbulence during acceleration, allowing the engine to exhale the exhaust gasses with less restrictions. This means you will have improvements in throttle response, along with increases in both horsepower and torque. 

This exhaust will come with a beautiful 101MM polished tip, and the exhaust hangers are welded onto the stock location of the pipes so you don't have to perform further modifications.

New gaskets and hardware, will be included to make this exhaust system ready for installation.

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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: 1
Tip Shape: Round
Tip Size: 101mm

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.



This product has no user uploaded media. You can upload your photo or video of your install by posting a review. Reviews:
Verified Purchase

Just what i was looking for
JARVIS 4 years ago
Delivered fast, and the sound is what i wanted. It has a low rumble that's not obnoxious. I expect it to get a bit louder when i get the down pipe. Other than that, simple instal and good stock look. I recommend it.
Verified Purchase

Excellent product...
dlewis1 4 years ago
My expectations far exceeded. 1) Was apprehensive that it would be much too loud. But this was not the case. Excellent sound at moderate volumes. 2) Quality and fit left nothing to be desired. Especially given that this was DIY. Good job!!
Verified Purchase

Nice, but...
Rah 6 years ago
The fitment is good and the quality is outstading, but the flexible part is too low and it scratches all the time on bumpy roads, specially if you're wearing lowering springs. The sound brings the boxer rumble to life but is near to stock, you must use a DP to give it an extra tone. I had to sell it before almost breaking it (on the terrible roads) in 6 months.
Verified Purchase

Q300 2010 WRX
lawrence421653691 7 years ago
B*****!!!!!! Great exhaust, very nice look, easy DIY installation. Sounds a little louder than stock during normal driving but with that Suby boxer rumble. Higher RPMS brings the Q300 to life!
Verified Purchase

awesome exhaust!!!
mmsi100276767 7 years ago
The quality is outstanding, the fit is perfect, & the sound is perfect. Its just loud enough with no highway drone. Highly recommend this exhaust.

  • Q: Boost Creep?  itzbmac 3 years ago


    Hi, Im just wondering whether this, combined with an Invidia Catted divorced DP will cause any boost creep issues on my 08 WRX? Any help would be greatly apprecaited! - Mac

    • A: Generally catted downpipes are not subject to the boosting issues like catless downpipes. You should not see any issues.

      Josh P. 3 years ago
  • Q: Flow  Wesleyy128874063 3 years ago


    So in regards to the first pipe that starts at the cat. I see two cannisters a small that looks like a flexible mesh and a medium size one that is straight pipe. Can you tell me what they are there for and if that will cause flow restrictions compared to the other cat backs that don't have that in there pipes? Thank you

    • A: The mesh looking part is a flex pipe and is used to help make installation easier by allowing the midpipe to bend a little. The larger solid canister is actually a resonator, which helps smooth out the sound of the exhaust. Neither will restrict flow.

      guest56ad69792a8d256e198b66b5 3 years ago
  • Q: Invidia Q300 sound clip  SamG 4 years ago


    Hey I was just wondering if anyone has a sound clip of this exhaust? If you do I would love to hear it

    • A: We unfortunately do not have a video or sound clip of this exhaust, but there are several videos on Youtube.

      Zach G. 4 years ago
  • Q: Fit with Cobb DP?  Bonzai 4 years ago


    Hello folks, I have a Cobb catted downpipe on my 2009 WRX 265 Hatchback. It tapers to 2.5 as you guys well know. I've heard some people connecting it without any adapters but is that really fine? Does the Grimmspeed 2.5 to 3 adapter work? I've heard conflicting things on the Grimmspeed adapter working or not with the Cobb DP--Invidia Catback.

    • A: You can use an adapter, or you can use the Remflex gasket. Either one will work.

      Kyle A. 4 years ago
    • A: @Kyle A. so this is the gasket you were talking about? If so I'm glad I asked, that's much cheaper. Cheers.

      Bonzai 4 years ago
  • Q: fit  will.kinnard15510 4 years ago


    Will this fit cleanly with a Grimmspeed down pipe?

    • A: This catback will fit well with the Grimmspeed downpipe.

      Zach G. 4 years ago