Performance Dual-Pass Top Mount Intercooler with Pipe Kit for BWM S55. Description: Multiple air dividers cast into bot the hot /cold side end tanks for maximum air flow Custom designed liquid-to-air intercooler core 60% increase in core size than OEM Left-Right, cross-flow, dual-pass core configuration with 2-stage water cooling for maximum efficiency and help minimize heat intake temperature Designed with 3D scanning of ensure precise fitment and maximum surface area Pre-capped 1/8 NPT bung into each pipe By increasing the size of engine booster by tube, more airflow is allowed.