Hobbywing HW-86080080 FAN-MP3010SH-5V-10000RPM@5V-BLACK-B 86080080 Cooling Fans Motor / ESC / Cooling Fan
Using this type of fan set up inside ESC heatsink, you will have essentially the most cooling performance.
Specifications: Oil/Porous Bearing / Waterproof / JR-3P Male Plug / L=50MM
Applications: EZRUN MAX8, EZRUN-WP-SC8, QUICRUN-10BL60