I am in the market for a "box" for my bike and I notice that there are several different types being used. What are the main differences in these boxes? What advantages or disadvantages does one have over another. I have been leaning towards a "Gils Box" because I have seen more of those mentioned. I'm talking about the Techlusion,PcIII, mainly. Is is better to just have a Harley Race tuner used instead?