regulations... Euro IV emmision standards came in, making the the rolla go from cable throttle to drive by wire electric throttle and other changes made the rolla detune
basically i doubt u can feel a difference at all, that 7kw at the fly so not much at all at the wheels, and btw toyota only claim 100/93kw u never really know how much your car has without testing it. can be very different between 2 identical rollas.
This has been covered heaps mate, try searching for "Pete"