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Replace or upgrade the stated vehicle fluid reservoir with this application-specific Moroso tank. Verify the circuit, ports, hoses, cap, sensors, mounting points, and complete vehicle application before ordering.
Key Features
- Billet Aluminum Build: Lightweight at 1.4 lbs yet strong enough for high-pressure racing applications, resists cracking under heat cycles.
- 50% Larger Capacity: Holds 32 ounces versus stock 20 ounces, accommodates expanded coolant from turbocharged setups without spilling.
- Threaded OEM-Style Cap: Ensures airtight seal to prevent contamination and pressure loss, includes vent for safe operation.
- Weight: 1.4 lbs product, 2 lbs shipped.
- Direct Bolt-In Fit: Matches OEM mounting points for 02-07 WRX/STi with no cutting or fabrication needed, installs in under 30 minutes.
- Black Anodized Finish: Protects against corrosion and road salt, maintains clean engine bay appearance over time.
Fitment
| Years | Make | Model | Application Notes |
|---|---|---|---|
| 2002-2007 | Subaru | WRX | Coolant expansion tank |
| 2004-2007 | Subaru | WRX STI | Coolant expansion tank |
Specifications
| Brand | Moroso |
|---|---|
| Manufacturer Part Number | 63785 |
| Product Type | Expansion Tanks |
| Fitment Type | Vehicle Specific |
| Listed Configuration | 02-07 Subaru WRX/Sti Coolant Expansion Tank - Direct Bolt-In Replacement |
| Condition | New |
What's Included
One new Moroso expansion tanks identified by manufacturer part number 63785. Hardware, seals, hoses, fittings, wiring, fluids, tools, and companion parts are included only when expressly supplied for this exact part number.
About Moroso
Moroso develops oiling, cooling, ignition, suspension, electrical, drivetrain, wheel, and racing components for automotive performance applications. Selection and installation remain exact-part-number specific.
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Frequently Asked Questions
For Moroso 63785, will this tank connect to the factory hoses?
Confirm the exact vehicle application, fluid circuit, port locations, hose sizes, cap, sensor provisions, and any transferred factory components before ordering.
Can this tank be packed with ice?
Only supercharger or intercooler reservoirs specifically designed for that use should be treated that way. Follow the current Moroso instructions for the exact part number.
How should the system be checked after installation?
Use the correct fluid, bleed trapped air as required, pressure-check every connection, inspect for leaks, and recheck fluid level after the first complete heat cycle.
Installation Instructions
Follow the current Moroso instructions and vehicle service information for part number 63785. Verify every interface and clearance, work on a cool and safely supported vehicle, use the specified seals, fluids, fasteners, and torque procedures, inspect for leaks or contact, and recheck the installation after initial use.
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