E39 M5 TRI-CORE RADIATORE39 M5 TRI CORE RADIATOR CALL FOR S H PRICING The RK Autowerks tri core radiator uses CSF cores with a B tube technology that increases the surface area over competitive all aluminum radiators and is slightly better than OEM (the OEM cores are very very good). This unit is a drop in plug and play radiator that will replace the OEM unit. No modifications to the vehicle need to be made in order to use the radiator. Currently on backorder until mid late
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