Primary one used by everyone is HPTuners. There's some older platforms like DHP PowrTuner and similar legacy units, but HPT has much more of a knowledge base of customers actively posting how-to videos on YouTube and forums.
HP Tuners all the way. With a little practice and by doing some scans with the VCM scanner you can log exactly how your engine is performing. Then you can easily make changes with the editor to maximize performance. Lots of help and tuning tips are available on the HP Tuners forum.
Ya, I just got one this year after having a DHP since the initial pre-order in '03-04. They were both born of the 3800 market, but HPT continued to bugfix & advance the interface development further, to a point that looks similar to every top tier aftermarket scanner/editor (Holley, FuelTech, Haltec, etc.).
They weren't saints in the way the tech initiated, but theoretically, nobody unlocking pcm's was. That's some 'Inside Baseball' that I only gathered from the outside looking in, and the big players will probably never tell us anything beyond partial info from those who lost out, since there's millions at stake.
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