The r10 pro 160 amp is able to run a 4 pole also. Anything that can run the 4 poles can do a 2 pole 550, but the reverse is not true. The HW120 amps and Sp equivalents can power a 2 pole 550 and a 4 pole. My viper vtx10R is only 2 pole 4.5 550 rated. When I get my truck, I hope to use that esc and not buy another. Unless maybe tekin releases a 4 pole capable 1/10th esc. I don't like to buy esc's that don't fit in my b4.