CSF N55 Race-Spec Oil Cooler - F2X 2-Series | F3X 3-Series | F3X 4-SeriesNOT FOR SALE IN CA. FREE SHIPPING BMW N55 CSF Oil Cooler is an innovative 2 core in series design. It is converted to a single pass design with high pressure return line for optional flow. Secondary in series backside cooler has an additional 5 rows of cooling for a ~40% increase in heat rejection. CSF's Oil Cooler is World's 1st and only true "plug and play" upgraded engine oil cooler for the BMW N55 engine. Its "Drop in fit" feature requires no
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