BMW F8x CSF Top Mount Charge Air Cooler - Wrinkle BlackProduct Details CSF is proud to announce the first ever cast endtank designed top mount intercooler for the BMW S55 engine! Utilizing multiple air dividers cast into the hot cold side endtanks for optimized air flow. CSF designed this liquid to air core from a blank slate, and completed extensive testing and analysis to ensure optimum performance and cooling. The core itself is 60% larger and features a dual core cross flow design with 2 stage water