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So basically after reading this thread, the consensus is:  Buy the nGage and get the tunes you want.  Aftermarket IC is optional,. not really needed for the majority of daily drivers.  CAI is rarely mentioned, so I assume it's another "optional" add on.  Jury also seems out on the lower temp (170 deg.) thermostat.  I assume that plugs, or a re-gap, would be fairly essential with the added boost, but I don't see much reference to that.  Some do, some don't, or is this something that almost everyone is doing at the time of Tune?