If I ever decide at short notice to give it some while still in 'D', I will normally override it around 6/6500, as I feel the power goes off pretty quickly with a ko3 around there, I know there is still good power to the limiter, but feel I'd be more beneficial to change around 6500 max. Different story with a ko4 I would think though as they don't run out off puff like our wee turbo does!