A bit of a noob question regarding UEL install
 

I recently returned from a trip out of state (without my car), and when I got back i found out my car had been broken in to and my Openflash Tablet was stolen. I just got my Gruppe-S UEL and overpipe back from 2000*F ceramic coating and am running out f time to install it before my next round of summer engineering classes start. Would it be detrimental to install the new header on the base OFT Stage 1 tune that my car is currently stuck on, and daily drive a few miles a day on it for about a week while I wait for another OFT to arrive?
I know a CEL may be thrown and I don't mind that for a week, I'm looking for concrete reasons, why I maybe shouldn't install it yet, related to engine life and health: if there even are any. Thanks!

It will be fine. I'm running a catless UEL with no tune at all.

Im also in my second month of running catless revwork uel headers and had to clear the cel but no signs of damage or anything, it might make the car run rich but itll be fine without a tune, dont know about a stage 1 tune tho

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You can run it forever if you want.