SKU: 63781 | UPC: 84663637810
Moroso 99-05 Mazda Miata Coolant Expansion Tank – Direct Bolt-In Replacement
The Moroso 63781 coolant expansion tank serves as a direct bolt-in replacement for the factory plastic tank on 1999-2005 Mazda Miata models. Crafted from billet aluminum, it offers greater durability and a larger 40-ounce capacity to handle expansion during high-performance driving. This upgrade reduces boil-over risk and maintains consistent cooling on track or street.
Key Features
- Billet Aluminum Construction: Resists corrosion and cracking far better than OEM plastic, ensuring long-term reliability under heat stress.
- 40-Ounce Capacity: Provides 50% more volume than stock 25-ounce tank, accommodating extra coolant for sustained high-RPM operation.
- Direct Bolt-In Design: Matches factory mounting points with no modifications, includes OEM-style fittings and pressure cap.
- Black Anodized Finish: Delivers clean underhood appearance while protecting against oxidation and wear.
- Integrated Baffle: Minimizes sloshing and air pockets for stable coolant levels and improved system efficiency.
Product Notes
- Pre-assembled with cap and hardware for immediate use.
- Flush system before install to remove contaminants from prior tank failure.
- Special order item, allow 3-5 business days for processing if out of stock.
Installation Notes
- Professional installation recommended.
- Drain coolant, remove OEM tank using 10mm socket on mounting studs.
- Uses factory hoses and hardware, torque studs to 5 ft-lbs.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1999-2005 | Mazda | Miata (NB) | All |
Why Choose Moroso?
- Over 60 years engineering cooling solutions for racers and enthusiasts.
- High-strength materials tested in NHRA and SCCA competition.
- Precision CNC-machined components for exact OEM fit and function.
Frequently Asked Questions
- Q: Will this fit my 2001 Mazda Miata LS?
A: Yes, the Moroso 63781 bolts directly to all 1999-2005 Miata NB chassis models including Base, LS and SE without alterations. - Q: What material is the tank made from?
A: Billet 6061-T6 aluminum with black anodized coating for heat resistance and durability over plastic. - Q: Does installation require special tools?
A: Basic hand tools suffice, 10mm socket for studs and pliers for hose clamps, completes in under 30 minutes.
Shipping & Handling
- Method: UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: Ships in 10 x 6 x 6 inch box
- Weight: 1.45 lbs
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