Koyo
Koyo VH093890 All-Aluminum Performance Radiator - 2022-2025 Subaru WRX
Fits Your Vehicle
Shopping from the main store — check the fitment notes in the description, or pick your platform to shop parts verified for your car.
Overview
The Koyo VH093890 All-Aluminum Performance Radiator is the definitive cooling upgrade for the 2022–2025 Subaru WRX (VB chassis), engineered by Japan's largest aftermarket radiator manufacturer to outperform the factory plastic-tank unit under every driving condition. Featuring Koyorad's signature 36mm Hyper Core technology, this direct bolt-on radiator replaces the OEM's failure-prone plastic end tanks with precision hand-welded, aircraft-grade aluminum construction — the ideal solution for daily drivers, canyon runners, and track day enthusiasts who demand maximum thermal reliability from their WRX.
Key Features & Benefits
- High-Density 36mm Koyorad Hyper Core — Delivers significantly improved heat dissipation over the OEM radiator, keeping coolant temperatures stable under spirited street driving and sustained track sessions.
- All-Aluminum, Hand-Welded Construction — Aircraft-quality aluminum end tanks replace the factory plastic design, eliminating the risk of heat-cycle fatigue, cracking, and coolant leaks that plague OEM plastic-tank radiators over time. The all-aluminum build can be welded and repaired, making it potentially the last radiator you'll ever need.
- Direct Bolt-On Fitment — Engineered to drop directly onto the 2022–2025 Subaru WRX factory mounting points with zero cutting, trimming, or additional hardware required.
- OEM Fan & Shroud Compatible — Fully retains compatibility with your factory fan and shroud assembly, preserving factory airflow (CFM) specifications for reliable cooling performance without forced modifications.
- Triple Pressure-Tested Quality Assurance — Every individual unit is pressure-tested three times during production in Koyorad's private ISO 9001-certified factory, ensuring industry-leading leak-free performance right out of the box.
- Brushed Aluminum Finish — Koyorad's signature brushed aluminum aesthetic delivers a clean, motorsport-inspired look under the hood while providing inherent corrosion resistance for long-term durability.
- CARB Compliant — Approved for use in all 50 U.S. states including California.
Why Upgrade from the Factory Radiator?
The 2022–2025 Subaru WRX comes equipped from the factory with a plastic-tank radiator. Over time and under repeated heat cycles, these plastic tanks expand, contract, and eventually crack — leading to coolant leaks and potentially catastrophic engine overheating. The Koyo VH093890 eliminates this failure point entirely with a 100% welded aluminum core and end tank design that grows stronger with age, not weaker. For WRX owners running any level of modification — a tune, upgraded intake, or upgraded turbo — a performance radiator is a critical reliability investment, not just a power upgrade.
What's Included
- 1x Koyo VH093890 All-Aluminum Performance Radiator
Note: Radiator cap not included. Koyorad SK-C13 High-Performance 1.3 bar Hyper Cap (sold separately) is recommended. Drain plug part# PI1186 (M10 x P1.25) is also available separately.
Specifications
| Manufacturer Part # | VH093890 |
|---|---|
| SKU | koyVH093890 |
| UPC | 847839021550 |
| Brand | Koyo / Koyorad |
| Core Technology | Koyorad Hyper Core |
| Core Depth | 36mm (approx. 1.42") |
| Overall Dimensions (L x W x H) | 36 x 18 x 6 in |
| Construction | 100% All-Aluminum, Hand-Welded |
| Finish | Brushed Aluminum |
| Quality Certification | ISO 9001-Certified Manufacturing |
| Pressure Testing | Triple Pressure-Tested Per Unit |
| CARB Compliant | Yes — 50-State Legal |
| OEM Fan/Shroud Compatible | Yes |
| Drain Plug Thread Size | M10 x P1.25 |
| Recommended Coolant | 50/50 Prediluted Antifreeze / Distilled Water |
| Country of Manufacture | Japan |
Fitment & Compatibility
The Koyo VH093890 is specifically engineered for the following vehicle application:
- 2022–2025 Subaru WRX (VB Chassis) — All Trims
This radiator is a model-specific, direct-fit unit developed and validated for the 2022-generation WRX platform. It is not compatible with previous-generation WRX or WRX STI models (2008–2021). For 2008–2021 WRX / STI fitment, see Koyo part# VH091662.
Frequently Asked Questions
Is this radiator CARB compliant? Yes. The Koyo VH093890 is CARB approved and 50-state legal.
Does it work with my stock fan and shroud? Yes. This radiator is fully compatible with the OEM fan and shroud assembly, maintaining factory airflow (CFM) requirements with no modifications needed.
What coolant should I use? Koyorad recommends a prediluted 50/50 antifreeze/distilled water mix. Do not use Dex-Cool or additional coolant additives, as these lack the necessary anti-corrosion properties for all-aluminum radiators.
Do I need to flush my cooling system first? Yes. A complete cooling system flush — including the heater core — is mandatory prior to installation to remove old coolant, contaminants, and mineral deposits.
Is a radiator cap included? No. A radiator cap is not included. The Koyorad SK-C13 1.3 bar Hyper Cap is available separately and is highly recommended.
Installation
The Koyo VH093890 is a direct bolt-on replacement designed to install on factory mounting points with no cutting, drilling, or modification required. Transfer your OEM fan and shroud assembly to the new radiator using the stock hardware. Prior to installation, perform a complete cooling system flush and refill with a 50/50 prediluted antifreeze/distilled water mix per the vehicle's factory service manual. Professional installation is recommended to ensure proper burping of the cooling system and to verify leak-free operation. Post-installation, confirm that: (1) all hose connections are secure and leak-free, (2) air pockets have been purged from the system, and (3) factory fans and shroud are reinstalled, plugged in, and fully operational.