Innovative 2-core in-series system. Front full size core has 17 cooling tubes versus OEM 15 tubes Secondary in-series backside cooler has an additional 6 rows of cooling Made with CSF’s AC condenser technology using a 1-row super-high pressure 26mm multi-channel microtube. High-density multi-louvered fin design for maximum surface area contact. “Drop-in fit” requiring no modifications to install. Accepts all attaching OEM components including oil-line connections, mounting brackets, and shroud/ducting World’s 1st and only true “plug-and-play” upgraded engine oil cooler for the BMW N55 engine in the BMW F87 M2 (2016+) Track tested in 103℉ (115 ℉ heat index) – max oil temperature achieved 240℉. This is a reduction from 275/280℉ track oil temperatures (limp mode) when testing with the upgraded CSF cooler on the vehicle versus the OEM cooler. Need additional ½ quart for proper fill-up during installation (OEM cooler is 7 quarts. CSF’s upgrade Race-Spec M2 oil cooler required ~7.5 quarts to fill up properly.