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Does the hfs-3 merely ensure safe running or does it boost power as well? How are the gains with the rmw tune on an r56 s (non-jcw)? More so than with an alta AP tuner?
You question asks the difference between a tuner and a tool used to tune. If you are comparing the tool RWM uses, the dimsport, then I would say the AP is far superior in tuning capacity, end- user options, and tuning support.