best vid ive found showing the power of the feigao xl motors

[crazyjr]

The only reason i am reconsidering a 7xl is that i'm thinking a 8 or 9xl might be a better option for me. I'm looking for a setup that is more efficient with a 5s lipo upper limit, because anywhere i race here i will be racing against nitro's and i need an ultra efficient setup to run long mains without pitstops (even one in a 30 min main would be a problem).