I was under the assumption that the AXI setup was a better performer and would out last the eflight outrunner. I seen the eflight motor on the chief aircraft web site but it doesn't list the size other than the 370. Right now im looking at the batteries Im asuming that the 3 cell batteries will spin the prop faster and i should down size the prop from a 10X4.7 to a 9.38 if i go to a 3 cell im figuring 1.5oz to 2 oz on the battery deciding on this stuff is a pain. i will save about $45 if i use the outrunner 370 the battery thing is driving me nuts