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You should be able to drive the car same day as the tune install. The greatest risk that you might have is a battery that could die on you given that it's either not strong enough or you don't have another vehicle to keep it charged (as the car is off but the DME is having to work while the car isn't being powered by the alternator). Everything else should work as new, especially with such a renowned tune.
As far as the intake and the exhaust, they add a little bit of a difference as you're removing some of the restriction, but on our cars, until you really start deleting the catalytic converters (on the headers mostly from US-spec Z4s) or the cats in the section 2, you really won't have that much of a difference from the stock components. There is more flow for your car and of course more sound with that flow, although the actual difference from stock isn't all too great.
Bottom line:
No true advantage to shipping the DME in unless you'd just want a hands free experience and a slightly longer wait time. (Should have a second vehicle or battery tender on hand if you should choose to do it at home). You'll also get the diagnostics capabilities should you do it at home (to my knowledge), I didn't mention this above.
On the upgrades, doesn't hurt to let them know, but you're not going to gain a ton by informing them of those particular upgrades if much at all.
Hope that helps!
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◙ Shane
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