Invidia Q300 Cat Back Exhaust

Part #: INV HS08STIG3S
( 20 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: 101mm
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 Hatchback 2011, 2012, 2013, 2014WRX Limited Hatchback 2011, 2012, 2013, 2014WRX Hatchback 2011, 2012, 2013, 2014WRX Premium Hatchback 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.

REVIEWS ( 20 )


Verified Purchase
Great Quality Sound
306Scooby 2 months ago
Great product from start to finish. Immaculate pipes and welds, all supplied bolts/gaskets and a beautiful sound. Was not positive on how loud it would be, nice Subaru sound at normal driving but let me assure you this is not a quiet system when on the throttle. You wont regret this purchase. Installed on 2011 STI
Verified Purchase
Great Exhaust!!
findtheline00124497 8 months ago
This exhaust looks and sounds great! Even after a tough South Dakota winter the Tips polished up very nicely and the muffler still has that nice mirror finish. Great product, would highly recommend to hatchback owners looking to get the full effect of the sound of a boxer engine. This one is not aggressively loud, it sounds great for a daily driver.

2011 STi Hatchback Invidia Q300 Catback
ja.colindres42806 9 months ago
I am the type of person who rarely write reviews. However after the simple 1 hour installment and the amazing Subaru Boxer rumble that came out of those pipes, I felt like I had to write a review. I got the Cat-back exhaust and it sounds great. There isn't the drone-like sound at high speeds (around 65-80 mph) which is great because I do a lot of highway driving. It isn't EXTREMELY loud when driving through town. However it gives off a rumble during down shifts. But no matter what there should be no reason why anyone should be complaining on how loud the exhaust is because your getting exactly what you paid for which is the Subaru Boxer sound that you have been wanting from the beginning. I would totally recommend this exhaust if your just looking for a good bass like normal exhaust without attracting too much attention to yourself as well.

All around great
jriley87 11 months ago
Super easy install less than 45 minutes, did not need to buy an adapter for my stock down pipe and I have 0 exhaust leaks! Not super loud so if loud is what you want don't buy this one. Has a nice deep rumble. 2013 Wrx pro tuned on 18 psi and cat back.

Sounds and Looks great
2011wrxSWPhatch 1 year ago
Easy install. Looks Great. Mine is mated with the Invidia Catted DWG DP. Does hang a tad lower than the stock exhaust, because of the larger diameter piping, for you guys that are lowered. It does DRONE, especially on decel between 3k-1500rpm, like A LOT. The amount of bass drone might be unbearable to some. Sounds great on acceleration and WOT. Downshift Rev Matching sounds beautiful nasty, giving a throaty deep gurgling sound. Also can hear slight turbo spool sound.


  • AnswerQ: Gaskets  raulb5006107 6 months ago

    I have a 2014 wrx hatchback. What gasket should I use when installing this catback to my stock downpipe?

    • A: Using the donut gasket and Grimmspeed's OEM downpipe to 3 catback gasket would be the best fit and finish.

      Nick S. 6 months ago

  • AnswerQ: Will it fit?  coloRADo 12 months ago

    I have an 09 hatch. I know this won't fit unless I do modifications to the rear diffuser. Do you know if any other modifications will be needed?

    • A: We have not tried to install this on a 2009 model and we do not know what modifications would be required to make it fit.

      Zach G. 12 months ago

  • AnswerQ: '14 WRX hatchback  sf89 1 year ago

    Will this exhaust fit a 2014 WRX hatchback without huge modifications?

    • A: This exhaust will be a direct fit for the 2014 WRX hatchback and no modification is necessary.

      Zach G. 1 year ago

  • AnswerQ: ACCESSPORT V3  rayman 1 year ago

    Will I need a pro tune since this issnt a cobb product or will stage 2 catted downpipe tune also work for this exhaust?

    • A: Tuning is not required for Catback Exhausts. And as long as you have the Catted Downpipe and this exhaust you can flash over to Stage 2 using your AccessPort.

      Brady R. 1 year ago

  • AnswerQ: Which is louder?  Boosty07 1 year ago

    Would you say this or the Dual N1 (INV HS08STIGTP) is louder?

    • A: In terms of decibel volume, the N1 would be much louder than the Q300. A good rule of thumb with Invidia, the less exits the exhaust has the louder it will be.

      1 year ago