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SKU: HS15SWADOC
Invidia 2015-2021 Subaru WRX Automatic Transmission Downpipe with High Flow Cat
The Invidia HS15SWADOC downpipe replaces the restrictive factory unit on 2015-2021 Subaru WRX automatic transmission models. Crafted from premium T304 stainless steel this part delivers smoother exhaust flow for noticeable gains in horsepower and torque. It fits Base Premium and Limited trims with direct bolt-on installation while including a high flow catalytic converter for balanced performance.
Key Features
- Mandrel-Bent T304 Stainless Steel: Provides corrosion resistance and consistent diameter for unrestricted exhaust flow
- High Flow Catalytic Converter: Lowers backpressure to improve engine breathing and throttle response without sacrificing emissions standards
- 3-Inch Diameter Piping: Allows higher exhaust velocity for power increases of 10-15 horsepower and enhanced turbo spool
- Direct Bolt-On Design: Matches OEM mounting points for straightforward replacement on WRX CVT models
- Polished Finish: Adds undercarriage style with durable mirror-polished surface that resists heat discoloration
Product Notes
- Designed exclusively for automatic transmission Subaru WRX models
- High flow cat supports EPA testing compliance for street use
- Ships securely packaged to prevent damage during transit
Installation Notes
- Professional installation recommended.
- Requires removal of factory downpipe and catalytic converter assembly
- Compatible with stock O2 sensors and hangers no additional hardware needed
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2015-2021 | Subaru | WRX | Base |
| 2015-2021 | Subaru | WRX | Limited |
| 2015-2021 | Subaru | WRX | Premium |
Why Choose Invidia?
- Established Japanese exhaust manufacturer with motorsport heritage
- Uses only high-grade T304 stainless steel for longevity
- Engineered for precise fit and real-world power gains
Frequently Asked Questions
-
Q: Does this fit 2018-2021 Subaru WRX automatic models?
A: Yes HS15SWADOC bolts directly to 2015-2021 WRX CVT models including Base Premium and Limited trims -
Q: What material is the downpipe made from?
A: Constructed from full T304 stainless steel with mandrel bending for durability and smooth flow -
Q: What warranty coverage is provided?
A: Backed by Invidia's limited lifetime warranty against manufacturing defects when installed properly
Shipping & Handling
- Method: UPS Ground
- Availability: In stock - ships same or next business day
- Packaging: Ships in one reinforced box approximately 40in x 12in x 8in
- Weight: 11 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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