Your E63's Transmission Is Heating Your Intake Air: Stock vs. Split Cooling, Measured Posted in October 30, 2026 by ModalWorks A customer logged six back-to-back pulls on a tuned 2019 E63 S, stock vs. our Transmission Split Cooling kit. Divorcing the gearbox oil from the intercooler loop cut peak IAT rise over ambient by 36%. Full data and charts inside. Read more