1. Have found an interesting performance upgrade from Evotech
EVOTECHMOTORSPORT - Tuning Konfigurator

Stage 2 - 380Hp and 520Nm
Stage 3 - 401Hp and 560Nm

2. Other option is JB3 JB3 Burger Motorsports Juice Box Stage 3 PnP Performance Tuner BMW X6 N54 08+

386Hp and 480Nm

3. BMW ECU Remap | Evolve Automotive X6 35i
370Hp

Has anyone installed one of these? May be some other performance updates?
Interesting to know 0-60mph times.