Catalytic Converter for Subaru Outback (2015-2019) 2.5L
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Direct-Fit Stainless Catalytic Converter for 2015-2019 Subaru Outback (BS)
What it Does: This direct-fit assembly combines the front header pipes, flex joint, and ceramic catalytic converter for the 2015-2019 Subaru Outback (BS) FB25 2.5L H4 to restore emissions control and flow.
The Stock Subaru Outback Exhaust Failure
On the BS chassis with the FB25 2.5L H4 engine, factory converters face extreme thermal cycling right behind the cylinder heads. Thermal shock and minor misfires cause the internal ceramic monolith to crack, melt, or break loose. Additionally, the OEM flex joint and seam welds frequently fatigue and leak, allowing unmetered air past the upstream sensor and triggering persistent P0420 faults.
Common Symptoms of a Failing OEM Catalytic Converter
- Check Engine Light: Triggers P0420 or P0430 codes from degraded washcoat efficiency.
- Exhaust Rattle: Metallic noise at idle caused by a fractured ceramic substrate.
- Lost Power: Excess backpressure and failed emissions from restricted exhaust flow.
The Direct-Fit Stainless Exhaust Solution
This unit integrates the front header pipes, braided flex joint, and converter into one corrosion-resistant stainless steel assembly. Inside the 8-by-5-inch shell, a high-flow ceramic honeycomb substrate with precious-metal washcoat converts HC, CO, and NOx to satisfy OBD-II monitors. Factory head flanges, rear outlet flange, and dual O2 sensor ports ensure direct bolt-on fitment with zero cutting or welding.
What's Included
- 1 x Catalytic Converter Assembly
- 3 x Gaskets
- 3 x Studs with nuts
Technical Specifications
| Fitment | 2015-2019 Subaru Outback |
|---|---|
| Engine / Chassis | FB25 2.5L H4 (Boxer) / BS |
| Emissions & Substrate | EPA Federal (46-State Legal) / Ceramic Honeycomb |
| Installation Type | Direct Bolt-On OEM Replacement (No Cutting or Welding) |
Compatibility
- 2015-2019 Subaru Outback 2.5i Base (2.5L H4)
- 2015-2019 Subaru Outback 2.5i Premium (2.5L H4)
- 2015-2019 Subaru Outback 2.5i Limited (2.5L H4)
- 2015-2019 Subaru Outback 2.5i Touring (2.5L H4)
Frequently Asked Questions & Fitment Warnings
Does this fit the BS Outback?
Yes. This is a direct fit for the 2015-2019 Subaru Outback equipped with the FB25 2.5L H4 engine. Excludes the 3.6R model, and as an EPA federal unit (not CARB approved), it is not legal for vehicles registered in California, New York, Colorado, or Maine.
Will this clear P0420/P0430 codes, and are O2 sensors included?
Yes, if the OEM unit failed; O2 sensors are not included. Transfer your existing pre- and post-catalyst sensors or install new ones, and check for leaks before clearing P0420/P0430 codes.
Are gaskets and mounting hardware included for installation?
Yes. Includes three gaskets and three studs with nuts. Soak seized OEM fasteners with penetrating oil, torque evenly, and check every joint for exhaust leaks.
The Subaru Precision Standard
Built for boxer flow efficiency and CEL-free operation, this bolt-on assembly restores factory scavenging, reduces exhaust backpressure, and delivers reliable emissions compliance across every mile.
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