RE: feigao XL motors
no your amp draw on 6s will be closer to 200 amps [X(]
the 8xl is a great motor for 4s.
just because they say xl feigao motors are good for 6s doesn't meen all of them,its dependent on kv of the motor.
6s would give you over 46,000 rpm,way to much rpm.
if running 6s go with a 12xl other wise i guarantee all you will do is blow your gear up, esc fires in your boat make a hell of a mess and if its going in your cat hull (plastic) could burn a hole straight threw it.