I know you've PM'd about my TMIC, and frankly I have too many offers to even be concerned about steering you wrong. I'll say the same thing in public that I said in the PM response to your question. You do not need to change your tune if you're upgrading your TMIC. You won't do any damage.
However, you may squeeze a little extra performance out of the aftermarket TMIC (whichever you go with), which could mean problems reverting to the stock TMIC without retuning (or reloading the OTS tune).
Search the forums for information.