I dont know about the jspec but i belive it have more power than the 280hp that the paper says. I think it have 300hp + Its regulated by taxes, higher than 280 hp and the taxes increases. Or its a law thing. One thing for sure the euro M/T Z32 have 280 hp, and the euro A/T have only 268 hp. And this is done in the timingmap in the ecu pluss camshafts on the A/T version.