-46%
User 1
Click to zoom in
  • Guaranteed Fitment

    Always the correct part

  • In-House Experts

    We know our products

  • Warranty

    Warranty claims support

  • Cheapest Delivery

    Best shipping options available

Invidia 15+ Subaru STI 4Dr Q300 Single Layer Stainless Steel Quad Tip Cat-Back Exhaust

Invidia
INVHS15STIG2S
In stock
Catback
$2,480.80 $1,333.43
Upgrade your 2015+ Subaru STI 4-door with the Subaru STI Q300 cat-back exhaust featuring a single-layer...
$1,333.43

customers are viewing this product
Invidia 15+ Subaru STI 4Dr Q300 Single Layer Stainless Steel Quad Tip Cat-Back Exhaust

Upgrade your 2015+ Subaru STI 4-door with the Subaru STI Q300 cat-back exhaust featuring a single-layer stainless steel design and eye-catching quad tips. If you’re tired of the stock sound and want that perfect balance of aggressive tone and daily usability, this exhaust delivers. It unlocks a deeper, sportier exhaust note without overwhelming drone.

This system uses high-quality single-layer 304 stainless steel piping engineered to optimize exhaust flow and durability. The quad rolled tips give your STI a sharp, muscular look that stands out at the stoplight and on the track.

Installation is straightforward with a direct bolt-on fitment, making it an easy upgrade to enhance throttle response, increase exhaust efficiency, and improve your car’s aesthetics with a premium finish.


Features & Benefits

  • Single Layer 304 Stainless Steel – durable, corrosion-resistant for long life.

  • Quad Rolled Stainless Steel Tips – aggressive visual impact and polished finish.

  • Q300 Muffler Design – produces a deep, sporty tone without excessive noise.

  • Direct Bolt-On Installation – no cutting or welding required, hardware included.

  • Optimized Flow and Sound – improves throttle response and overall driving excitement.


Hook Section

Bring out the beast in your STI. This Q300 cat-back exhaust isn’t just about louder sound; it’s about refined power and aggressive style that commands attention. Perfect for daily drivers who want a statement exhaust with balanced tone.


Specifications

Specification Detail
Part Number invHS15STIG2S
Vehicle Compatibility Subaru WRX STI 4-door (2015 and newer)
System Type Cat-back Exhaust
Material Single-layer 304 Stainless Steel
Tip Style Quad Rolled Stainless Steel Tips
Piping Diameter Approx. 76 mm
Installation Direct Bolt-On, hardware included

REVIEWS

MK

Installed this Q300 exhaust on my 2017 STI in Portland, OR. The quad tips look sharp, and the sound is aggressive without being annoying on long drives.

Mark K.

Portland, OR

★★★★★
LA

Loving the aggressive tone this Q300 gives my 2016 STI in Atlanta, GA. The quad tips really make the back end stand out. Easy install too!

Linda A.

Atlanta, GA

★★★★★
Read More
Read Less
Effective Date: October 2024
We offer a 30-day return policy, allowing you to request a return within 30 days of receiving your item. To qualify for a return, the item must be in its original condition—unused, with tags, and in its original packaging. A receipt or proof of purchase is also required.

To initiate a return, please contact us at info@riotparts.com. Returns must be shipped to the address provided upon request. If your return is approved, we will issue a return shipping label along with detailed instructions.

Important
Returns sent without prior authorization will not be accepted.

For any return-related inquiries, please reach out to us at info@riotparts.com.

Return Shipping Address
The return shipping address will be determined based on the requestor’s location to ensure the nearest return facility is used.

Possible return locations include:
10880 Lear Blvd.
Reno, NV 89506, United States
931 W. Bardin Rd., Suite 150–200
Arlington, TX 76017, United States
3035 Campus Dr.
Hatfield, PA 19440, United States
5789 N. Graham Road, Ste 200
Whiteland, IN 46184, United States
2020 NE Aloclek Dr 4711 N Lamon Ave
#118 STE 12, Hillsboro, OR 97124, United States

Damages and Issues
We recommend inspecting your order upon receipt. If you find that an item is defective, damaged, or if you received the wrong item, please contact us immediately so we can address the issue.

Exceptions / Non-Returnable Items
Certain items cannot be returned, including:
• Electrical parts that have been installed or used
• Special order parts that were custom ordered for you
• Items that have been damaged due to improper installation or use

If you have questions or concerns about a specific item, please contact us for assistance.

Exchanges
For exchanges, the quickest option is to return the item you have. Once the return is accepted, you can make a separate purchase for the new item.

Refunds
We will notify you once we receive and inspect your return to inform you whether your refund is approved. If approved, you will be automatically refunded using your original payment method within 10 business days. Please be aware that it may take additional time for your bank or credit card company to process and post the refund.

If more than 15 business days have passed since your return was approved and you haven’t received your refund, please contact us at info@riotparts.com.

Your cart

×