Do I need a tune??

While some of you know that I received a good deal for being my tuner's first stock Z to drive tune, I now understand the cost of a tune. Down the road, when I do more mods (exhaust, intake plenum, etc...), I am ready and willing to shell out the money for proper tuning. I suspect I will wind up using the same tuner, even though some have been having communication problems with him - I have the option of scheduling a time to drive my car to him instead of e-tuning.