No need to mill the ESC. You can use the std b4 body with the 25mm fan. You just need to cut the 2 outside holes off the fan and mount it on top of the speedo but to the side next to the cells. 7.2 is also good. The new ESC with sintered run much cooler. You can run the 2wd at tracks like Kiddy and Tiverton without the fan but you may as well leave it in as it will be better for all equipment
rb
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