[Crisp]

I was introduced to Noelle too. They do advertise 850hp (crank) and offer warranty in case something goes wrong and BMW doesn't cover. Price is $3.7k+.
This is an actual flash.

As for piggy back, there's race chip and JB4 - both pretty much the same. Install is extremely simple (two top mounted sensors, then run OBD2 wires thru the firewall into the cabin).
I don't see it taking more than 15 min.

My F85 X5M was tuned by BM3. I had no complaints other than hating the burble / backfiring tune. I would rather do piggy-back to preserve warranty. Dealer was able to see that the car was flashed 20+ times even though I would always flash back to stock and RE-lock the ECU. So don't believe any of the "you can go back to stock and they won't see it" horse sht.

I'm looking for an exhaust more than a tune honestly. The car is super quiet. Even my wife commented on that (F95 X5M CP).