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Any of these aftermarket "tunes" will affect emissions to one extent or another, even if for no other reason than you burn more gas to go faster. And they might override some of the systems that would otherwise be used to reduce pollutants. If they say "for off road use only," it's probably for a reason. So, don't do non-street-legal engine mods if concerned about emissions. And you probably should have gotten a slower car in the first place! ;-)
IMO, the car is pretty darned fast, so go-fast mods aren't even on my radar, even though I only have the 28i.
In most cars, your best and most straightforward mod is a good set of tires. Maybe this doesn't apply as much for Xdrive? I'll have to think about non-RFTs.
I'd be curious to know if lowering would help with handling/performance. It's pretty tall, and IIRC, the skidpad results were not great on this car. Searching now, I only find figures for the new X1.
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