It's possible to get 280bhp from the 4efte, the better question is..."is it pratical?" On such a light car, FWD at that, much of that power/torque would be wasted in wheel spin in every gear. Also to get that power you will need a large turbine, high boost level=loads of lag. Your power band will be shifted to the top end only making the car unresponsive in the low-mid rpm range (this response is what make the starlet enjoyable) and undrivable in city/traffic conditions. This setup would be perfect for drag/illegal street racers imo.