Sadly people have some real odd preconceived idea that they will get a certain power rating.

Verso Automotive and their tuner will not push the car any further than what the engine is happy producing, even if it is 89hp. I personally think this is the way it should be, gone of the days where people say yeah lets push 20 psi and she'll be right.

If the engine's pinging.. STOP! , Investigate the reason first then continue.