CSF BMW F1X M5 & M6 Twin Charge-Air-Cooler Set - Crinkle Black FinishThe CSF Charge Air Coolers boast a 28% larger core size than factory per side. This greatly increases the capacity for heat transfer from the hot charge air from your F1X's Turbos. World's 1st Cast End Tank Designed High Performance Charge Air Cooler Set for the BMW F1X M5 M6 Custom Designed CSF Liquid To Air Intercooler Core (CFD Analysis and Testing Completed to Ensure Optimal Performance) 28% Increase in Core Size Per Each Charge Cooler Compared to