A HP Tuner does tune your PCM. So you would essentially be tuning an already tuned PCM. The benefit in doing an HP Tuner if you know how to use it, would be that you get to personalize the tune to your liking, etc. But if you already have a tuned PCM, I would not worry about it.

 

The learning curve for tuning yourself is very very high.

Recommend you read tuning forums etc before you even think about buying tuning software

 

yeah, if i want more tuning done to my PCM, ill just send it off somwhere. not worth messing something up you know?
LOL probably get my car shifting at 2500, speed limiter at 20mph, ect.