Moroso Coolant Expansion Tank 08-21 WRX / 08-21 STI | Fabricated Aluminum | Coolant Reservoir
Overview
The Moroso Coolant Expansion Tank is a direct bolt-in replacement designed specifically for Subaru WRX and WRX STI models from 2008 through 2021. This tank serves as a critical component in your vehicle’s cooling system, managing coolant overflow and maintaining proper pressure to prevent overheating. It is ideal for Subaru enthusiasts looking to upgrade from the factory plastic tank, which is prone to cracking and discoloration after prolonged exposure to high temperatures.
Crafted from durable fabricated aluminum, this expansion tank offers superior strength and longevity compared to OEM plastic units. Moroso’s design includes a billet aluminum cap and a provision for the factory siphon hose, ensuring seamless integration without sacrificing functionality. The tank’s finish can be customized through polishing, chroming, painting, or powder coating, allowing owners to tailor the look to their preference—whether for a clean OEM+ appearance or a race-inspired aesthetic.
For Subaru owners, upgrading to the Moroso expansion tank means enhanced reliability under demanding conditions, especially for those who push their WRX or STI on track days or spirited drives. The aluminum construction resists heat-related failure, helping maintain consistent coolant levels and system pressure. This upgrade supports the longevity of your engine’s cooling system and contributes to peace of mind during aggressive driving or extended use.
Features & Specifications
This Moroso Coolant Expansion Tank is engineered for 2008-2021 Subaru WRX and WRX STI models and features a fabricated aluminum construction with a billet aluminum cap. Constructed from high-strength aluminum, it delivers enhanced durability and heat resistance for Subaru enthusiasts seeking a reliable and visually customizable coolant reservoir.
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Brand: Moroso
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Product: Coolant Expansion Tank
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Part Number: 63871
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Fitment: 2008-2010 STI, 2008-2010 WRX, 2011-2014 STI, 2011-2014 WRX, 2015-2021 STI, 2015-2021 WRX
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Material: Fabricated Aluminum
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Finish: Raw aluminum (polishable, paintable, chromable, powder coatable)
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Construction: Welded fabricated aluminum
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Origin: Not specified
Key Benefits
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Durability: Fabricated aluminum resists cracking and heat damage common in OEM plastic tanks
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Fitment: Direct bolt-in replacement with factory siphon hose provision ensures hassle-free installation
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Customization: Versatile finish options allow for personalized aesthetics to match your build
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Reliability: Maintains consistent coolant pressure and volume under high-heat conditions
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Performance Support: Ideal for track and performance use where cooling system integrity is critical
What's Included
- 1× Moroso Coolant Expansion Tank
- 1× Billet aluminum cap
Installation & Compatibility
Installation of the Moroso Coolant Expansion Tank is straightforward for anyone with basic mechanical skills, as it is a direct bolt-in replacement for the factory tank. No special tools are required beyond standard hand tools. The tank includes a provision for the factory siphon hose, ensuring compatibility with stock cooling system plumbing. This part fits all 2008-2021 Subaru WRX and WRX STI models, but it is important to verify fitment for your specific year and trim before purchase. No tuning or modifications are required for installation.
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Professional Installation: DIY-Friendly
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Modifications Required: None
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Verify Compatibility: Confirm fitment for your specific year and trim level
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