I think the level of boost depends on which type of power adder is utilized, as 15 lbs with an eaton is going to create a dramatically different power level than 15 lbs through a 76mm turbo. I would say that the motors are capable of about 700 wheel, however they have been pushed to much greater power levels than that, how long they will last at 700+ depends on a multitude of factors (tune, driving style, etc..).