If I get a 2.5 16v but want an economy/lots of low end torque motor, would it be possible to fit the 2.3 16v or 2.2 16v factory cams to achieve this - I guess those motors were made for that and the 2.5 for top end power looking at the specs - any comments? Am I right in saying same motor/heads basically just different bore/stroke/cr/detail?