Thermal management requirements shift significantly between the two iterations of the 991 Carrera S and GTS. For the high-revving naturally aspirated 991.1 3.8-litre, managing engine oil temperatures through enlarged centre radiators and uprated water pumps is critical to prevent the ECU from retarding timing. Conversely, the twin-turbocharged 991.2 3.0-litre introduces forced induction heat, necessitating high-capacity chargecoolers to lower intake air temperatures and maintain density. Across both platforms, upgrading the frontal cooling capacity and ensuring efficient fluid circulation is essential for sustained track performance.