Koyo High-Performance Radiator – 1997–2005 Toyota Aristo JZS161 / Lexus GS300 (2JZ-GTE / 2JZ-GE) | Direct Fit

Upgrade or replace the cooling system on your 1997–2005 Toyota Aristo JZS161 or Lexus GS300 with the Koyo High-Performance Radiator — a direct-fit premium radiator engineered for the JZS160/JZS161 platform. Koyo is one of Japan's most respected OEM and aftermarket radiator manufacturers, supplying cooling systems to major Japanese automakers and the performance aftermarket. The Koyo HH-series radiator delivers improved cooling capacity over the factory unit — essential for the heat demands of the 2JZ-GTE twin-turbo engine in spirited street, touge, and track use, and a quality OEM-spec replacement for the naturally aspirated 2JZ-GE.

Key Features

• Koyo HH-Series – High-Performance Cooling: Koyo's HH-series radiators are engineered for improved cooling capacity over the factory unit — higher flow rate and improved heat dissipation to handle the thermal demands of the 2JZ-GTE twin-turbo engine under sustained high-load driving. A meaningful upgrade over the factory radiator for Aristo and GS300 owners who drive their cars hard
• Direct Fit – JZS160/JZS161 Platform Specific: Engineered as a direct-fit replacement for the factory radiator on the 1997–2005 Toyota Aristo (JZS160/JZS161) and Lexus GS300 — uses factory mounting points and hose connections for straightforward installation with no modifications required
• Fits 2JZ-GTE & 2JZ-GE: Compatible with both the 2JZ-GTE twin-turbo (JZS161 Aristo) and the 2JZ-GE naturally aspirated (JZS160 Aristo / Lexus GS300) — verify your specific chassis code and engine variant before ordering
• Koyo Quality – OEM-Grade Construction: Manufactured by Koyo Radiator Co. — a Tier 1 Japanese OEM supplier and one of the most respected names in aftermarket performance cooling. Koyo radiators are known for quality construction, correct fitment, and long-term reliability
• Toyota Aristo / Lexus GS300 Platform Note: The Toyota Aristo JZS161 (2JZ-GTE) is the JDM twin-turbo version of the platform; the JZS160 (2JZ-GE) is the naturally aspirated JDM version; the Lexus GS300 is the global/USDM naturally aspirated variant. Verify your specific chassis code (JZS160 vs JZS161) and engine before ordering

Specifications

• Brand: Koyo
• Series: HH High-Performance
• Type: Direct-Fit Replacement Radiator
• Fitment: 1997–2005 Toyota Aristo JZS160/JZS161 / Lexus GS300
• Engine: 2JZ-GTE (JZS161) / 2JZ-GE (JZS160 / GS300)
• Weight: 17.8 lbs
• Part Number: HH010647
• UPC: 847839021864

Note: Verify your specific chassis code (JZS160 vs JZS161) and engine variant (2JZ-GTE vs 2JZ-GE) before ordering — cooling system fitment can differ between variants. Coolant flush and refill required after installation. Verify correct coolant type for the 2JZ platform. Professional installation recommended.