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SKU: HS11STIG3S
Invidia Q300 Cat-Back Exhaust – 2011-2021 Subaru WRX/STI Sedan 76mm Stainless Steel Tips
The Invidia HS11STIG3S Q300 is the #1 selling premium cat-back exhaust for every 2011–2021 Subaru WRX & STI sedan. Hand-crafted from mandrel-bent 304 stainless steel with 76 mm piping, polished 110 mm slash-cut tips, and Invidia’s signature tuned mufflers delivering a refined deep tone, zero drone, +14 whp / +18 lb-ft gains, and dramatic weight savings. The ultimate daily-driver exhaust that still sounds ferocious under throttle.
Key Features
- Full 76 mm (3") Mandrel-Bent 304 Stainless – Maximum flow
- Dual Polished 110 mm Tips – Slash-cut, perfect fitment
- Tuned Mufflers + Resonator – Deep tone, zero cabin drone
- +14 whp / +18 lb-ft Gains – Dyno-proven on stock & Stage 2 cars
- Made in Japan – Limited lifetime warranty
Specifications
| Specification | Detail |
|---|---|
| Part Number | HS11STIG3S |
| Piping Diameter | 76 mm (3") throughout |
| Material | T304 stainless steel |
| Tip Diameter | 110 mm dual polished |
| Tip Style | Slash-cut, rolled edge |
| Power Gain | +14 whp / +18 lb-ft |
| Country of Origin | Japan |
| Warranty | Limited Lifetime |
Product Notes
- Fits 2011–2021 WRX & STI 4-door sedan only (GV/GR & VA chassis)
- Will NOT fit hatchback or 2022+ VB WRX
Installation Notes
- 100% bolt-on 45–60 minute install
- Uses factory hangers & gaskets (new gaskets recommended)
- Full color instructions included
This Part Fits
| Year | Make | Model | Body |
|---|---|---|---|
| 2011–2014 | Subaru | Impreza WRX / STI | Sedan |
| 2015–2021 | Subaru | WRX / STI | Sedan |
Why Choose Invidia Q300?
- Japan’s #1 name in premium stainless exhausts since 1998
- Every system hand-welded & dyno-tuned in Japan
- Chosen by more daily-driven & show STI sedans than any other brand
Frequently Asked Questions
-
Q: Will this fit my 2015+ STI hatch?
A: No, sedan only. Hatch uses HS11STIG3T. -
Q: Any drone on the highway?
A: Zero, Q300 is famous for deep tone with no drone. -
Q: Titanium version available?
A: Yes, Q300 titanium is HS11STIG3T (hatch) or HS11STIG3S (sedan).
Shipping & Handling
- Method: UPS/FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Official Invidia heavy-duty box
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At Invidia Exhaust, we are dedicated to creating exhaust systems that stand out for their exceptional craftsmanship, premium materials, and cutting-edge design. Our systems not only enhance vehicle performance but also elevate sound and aesthetics, catering to both racing enthusiasts and everyday drivers. Why Choose Invidia Exhaust? Performance Enhancement: Each exhaust system is meticulously engineered to reduce backpressure and boost engine output. Signature Sound: Experience an exhilarating exhaust note that sets you apart on the road. Precision Engineering: Designed using 3D scans of your vehicle's undercarriage for guaranteed precision fitment. Durable Materials: Made with Grade 304 stainless steel (or titanium for select systems) for exceptional durability and resistance to corrosion. Commitment to Quality With a commitment to ongoing technological innovation and stringent quality control, we ensure unparalleled performance, reliability, and durability in every product....
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