Performance Radiator for Lexus IS (2006-2015) 2.5L 3.5L

Direct-Fit High-Efficiency All-Aluminum Performance Radiator for 2006-2015 Lexus IS

Primary Function: Delivers superior thermal dissipation and structural reliability by replacing failure-prone factory plastic-tank radiators with a heavy-duty, all-aluminum brazed core assembly.

The Stock IS Cooling Weakness

Factory radiators in the XE20 and early XE30 Lexus IS platforms utilize composite plastic end tanks crimped onto an aluminum core with elastomeric O-ring gaskets. Over years of thermal cycling, engine vibrations, and sustained cooling system pressure, the factory plastic becomes brittle. This results in stress cracks around the upper inlet neck, seam separation at the crimp joints, and catastrophic coolant loss under aggressive driving or high-ambient operating conditions.

The Engineering Solution

Engineered as a direct bolt-in upgrade, this all-aluminum radiator replaces fragile plastic tanks with precision TIG-welded aircraft-grade aluminum end tanks. The brazed core features an optimized fin density and multi-louvered design, increasing fluid contact surface area and significantly improving heat transfer efficiency. By eliminating glued seams and crimped plastic joints, this radiator maintains consistent hydraulic pressure integrity and resists heat soak under severe track or street conditions.

Technical Specifications

Compatibility

• 2006-2015 Lexus IS250 2.5L V6 (RWD / AWD)
• 2006-2015 Lexus IS350 3.5L V6 (RWD / AWD)
• 2010-2015 Lexus IS250C / IS350C Convertible
• Does not fit IS F 5.0L V8
• Does not fit 2001-2005 IS300 (XE10)

The Lexus Performance Standard

Preserve the high-revving output of your GR-series V6 engine with track-ready thermal management that bolts directly into factory mounting points while utilizing stock fan shrouds and plumbing.