Mishimoto 15-20 BMW F8X M3/M4 Performance Air-to-Water Intercooler Power Pack - San Marino BlueOur improved core design features a bar and plate core with a 29% increase in core volume, as well as a unique single pass coolant flow layout for optimal heat transfer. Combined with our 16% increase in flow through the core we were able to record a 12F temperature drop in intake air temperatures while testing our full Power Pack. An air to water intercooling system wouldnt be complete without the heat exchanger. When it came to BMWs design, it was a