SKU: B800660 | UPC: 700424680634
Cobb Subaru 15-21 WRX/STI Coolant Overflow Tank
The COBB Coolant Overflow Tank serves as a direct-fit replacement for the factory plastic reservoir on 2015-2021 Subaru WRX and STI models. Constructed from durable billet aluminum, it holds 50% more coolant than stock (1.5L capacity) to handle demanding track or street use. Internal baffling minimizes sloshing for consistent cooling performance during hard driving.
Key Features
- Billet Aluminum Build: Resists cracking and corrosion far better than OEM plastic, ensuring long-term reliability in high-heat conditions.
- 50% Increased Capacity: Provides extra coolant volume (1.5L vs. OEM ~1L) to prevent overflow and maintain system pressure.
- Internal Baffling: Reduces fluid movement and air pockets, promoting stable temperatures under boost.
- Laser-Etched COBB Logo: Adds clean styling while maintaining functional strength.
- Complete Kit: Includes aluminum cap, stainless steel hardware, and O-ring seals for plug-and-play installation.
Product Notes
- Direct replacement for OEM part numbers 21214FJ000 and 21214FJ00A.
- Flush and refill cooling system during install use Subaru Super Coolant.
Installation Notes
- Professional installation recommended.
- Bolt-on fit requires basic hand tools 30-45 minutes for experienced installers.
- Hardware included no chassis modifications or trimming needed.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2015-2021 | Subaru | WRX | Base |
| 2015-2021 | Subaru | WRX | Limited |
| 2015-2021 | Subaru | WRX | Premium |
| 2015-2021 | Subaru | STI | Base |
| 2015-2021 | Subaru | STI | Limited |
Why Choose COBB?
- Decades of Subaru engineering experience from rally and track programs.
- Precision CNC-machined parts tested in real-world high-performance applications.
- U.S.-made quality with lifetime warranty against defects.
Frequently Asked Questions
- Q: Will this fit my 2018 WRX Premium?
A: Yes, direct bolt-on for all 2015-2021 VA-chassis WRX and STI models, no modifications required. - Q: What material is used and does it include the cap?
A: Billet 6061-T6 aluminum construction with black anodized finish kit includes vented cap, fittings, and hardware. - Q: What is the warranty and install difficulty?
A: Lifetime limited warranty straightforward DIY with basic tools, though pros advised for cooling system bleeding.
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock – ships same or next business day
- Packaging: Foam-padded cardboard box, 10″ x 7″ x 6″
- Weight: 1.1 lbs (product) 2 lbs (shipping)
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