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SKU: HS15SWMDOC
Invidia 2015-2021 Subaru WRX Manual Transmission Downpipe with High Flow Cat
Upgrade your 2015-2021 Subaru WRX manual transmission with the Invidia HS15SWMDOC downpipe featuring a high flow catalytic converter. This direct bolt-on part replaces the restrictive factory downpipe to improve exhaust flow and deliver noticeable gains in horsepower and torque. Crafted for precise fitment on VA chassis WRX models it enhances throttle response and engine sound.
Key Features
- T304 Stainless Steel Construction: Mandrel bent 3-inch piping resists corrosion and maintains shape for consistent long-term performance.
- High Flow Metallic Catalytic Converter: Reduces exhaust restriction to increase power output while meeting EPA testing standards.
- Pre-Welded O2 Sensor Bung: Ensures compatibility with factory oxygen sensors for seamless plug-and-play installation.
- Dyno Proven Gains: Delivers up to 12 wheel horsepower and 15 ft-lbs torque increases on stock tune WRX engines.
- Gasket and Hardware Included: Provides everything needed for a leak-free direct bolt-on replacement.
Product Notes
- Designed exclusively for manual transmission models check your drivetrain before purchase.
- High flow cat supports off-road use and emissions testing where applicable.
- Ships fully assembled ready for immediate installation.
Installation Notes
- Professional installation recommended.
- Requires removal of factory downpipe heat shielding use new crush gaskets for secure seal.
- Compatible with stock exhaust manifold and cat-back systems no cutting or welding needed.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2015-2016 | Subaru | WRX | Base |
| 2015-2016 | Subaru | WRX | Limited |
| 2015-2016 | Subaru | WRX | Premium |
| 2017-2021 | Subaru | WRX | Base |
| 2017-2021 | Subaru | WRX | Limited |
| 2017-2021 | Subaru | WRX | Premium |
Why Choose Invidia?
- Established Japanese exhaust manufacturer with motorsport heritage.
- Uses premium T304 stainless steel for durability and heat resistance.
- Engineered for exact OEM fitment with extensive dyno testing.
Frequently Asked Questions
-
Q: Does this fit 2015-2021 Subaru WRX with CVT?
A: No this downpipe fits manual transmission only CVT models require a different part number. -
Q: What material is the piping made from?
A: Full T304 stainless steel construction with mandrel bends for smooth flow and mirror-polished finish. -
Q: Is professional installation required and what tools are needed?
A: Professional install recommended basic tools sockets jack stands and OBD scanner for any check engine light reset suffice.
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock - ships same or next business day
- Packaging: Securely boxed 42 x 11 x 10 inches
- Weight: 11.5 lbs
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The downpipe is the first section of the exhaust system after the turbocharger, and on most factory turbocharged vehicles it is also the single most restrictive exhaust component due to its large catalytic converter and tight mandrel bends. Turbocharged car enthusiasts who shop for aftermarket downpipes range from street-driven daily drivers looking for a bolt-on power and sound improvement to track-day and time attack builders prioritizing maximum flow on tuned builds with larger turbos. Upgrading the downpipe removes the primary restriction in the turbocharged exhaust path and can produce measurable gains in peak horsepower, turbo spool time, and exhaust note character when properly paired with an ECU calibration. Well-known platforms that benefit strongly from downpipe upgrades include the Subaru WRX and STI with the EJ205 and EJ257, the Volkswagen GTI EA888, Ford Mustang EcoBoost 2.3L, Mitsubishi Lancer Evolution 4B11T, and the BMW N54 and N55 engines.Popular UpgradesTop afterma...
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Invidia
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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