CSF Radiator for VAG A3 S3/TT/Golf R/Leon Cupra

A triple-pass, all-aluminum radiator for Audi/VW MQB platform cars, using a thicker 2-row B-Tube core (42mm vs. stock 26mm) that routes coolant across the core three times for lower outlet temperatures. Drop-in fit, but incompatible with aftermarket intercoolers over 60mm thick; confirmed to work with AMS, APR, and 034 Motorsport intercoolers.