Airtec Motorsport | Rear Differential Cooling Duct | Toyota GR Yaris | G16E-GTS | 2021+The Airtec Motorsport Rear Differential Cooling Duct offers a simple solution to improving the differentials cooling ability, which helps to ensure rising temperatures dont cause any damage. When the oil inside the differential gets hot, its ability to lubricate and protect both the gears and LSD is reduced. This is more likely to occur during extended periods of hard use, such as on track, so it is beneficial to stabilise and reduce temperatures in