KOYO- HH012170 International part number
KOYO-KH012170 Is used by Koyorad USA
Koyo OEM Replacement # PL012170
Replace OEM Radiator 1640038210

The KH012170 (also commonly listed under part number HH012170) is a high-performance, all-aluminum racing radiator manufactured by Koyorad (Koyo Cooling Systems). It is a direct aftermarket performance upgrade engineered specifically to replace the OEM Lexus radiator 16400-38210.

Construction: 
Full TIG-welded, hand-crafted aluminum (eliminating the brittle plastic end-tanks found on the stock unit).
Core Style: 48mm (1.9") thick, two-row high-density "Hyper Core" design, offering over a 40% increase in core thickness compared to the OEM version.
Sensor Port: Includes an integrated 1/8 PT female accessory fitting to seamlessly mount aftermarket water temperature gauges.

Critical Installation Notes
Transmission Cooling Requirements: Koyorad removed the internal transmission fluid heat exchanger from this radiator to maximize engine cooling efficiency and prevent cross-contamination. Because of this, you must install an external auxiliary such as a davies craig oil cooler

Key Vehicle Applications
Lexus IS F (XE20)Years: October 2007-2014 (Specifically optimized for 2008–2011 models) Engine: 5.0L V8 (Engine Code: 2UR-GSE)
 

Note: Automatic vehicles will require an external transmission cooler. Factory radiator cap wont fit - Use SKC-13