Why does the new Axiom have 250 horsepower while it uses the same 3.5 direct injected engine as our vehicrosses?

The previous Axiom engines before 2004 also had lower HP (230 HP).

I am guessing since they are using the same engines we should be able to use the same measures Isuzu did on the Axiom to increase the ponies from ours.

Any ideas?

Your fellow Vehicross driver,
Mabry