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Two ways - Cobb Accessport if you are series one eight. Its a piggy back like the PFC for 3rd gens.
Second gut the stock CANbus PCM and run your own.
Some people have used GOODbox and a few other hacks into the PCM. But nothing is really out in the world that will get you much. Better off sticking to what you have stock or spend 1k to 2k for Cobb and tuning for ten or so HP. Really the major thing with Cobb is you can change or T-stat fan operation and make the oil injectors put more oil in.
Comes down to this. What and how much do you REALLY want to spend. Ask that question first then look to see what is out there.
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