The answer to your question...is that for the most part, from what I hear around and some experiences dealing with Sonics, yes, you heard pretty much correct.
They both deal with a different type of tuning software from what I understand though. However, you might want to go backwards. Talk to the shops first before you purchase the upgrades then that way you can see if they are comfortable and are willing to work on those software and tuning programs as well as the "package" that you are looking into purchasing.
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