BMW E9X M3 Racing Transmission Cooler

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From CarBahn

CSF High-Efficiency Transmission Cooler - E9X M3 (CSF Part #8042) Transmission Heat Management Dialed In. When it comes to track and high-performance driving keeping your transmission temps in check is just as critical as engine or oil cooling. The CarBahn High-Efficiency Transmission Cooler engineered in partnership with CSF is a drop-in solution for E9X M3s that delivers up to 30 greater cooling efficiency over the factory unit-without requiring any modifications.