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So, what to do? Let’s watch on the pictures and understand!
At first you need to install bigger and better wheels. Because wheels change view more all bumpers, spoilers, splitters and etc in sum. And wheels from Vossen are a good variant.
After wheels we can think about other parts. We carbon body parts. Real carbon, not stock hood wrapped in vinyl.
Bumpers and wide body kits are welcome too. There are many companies witch are producing body kits.
Other is by your taste. But always remember – build cool X6 from really fast X6. So you need X6 M. And think about color. Blue as on photos looks more aggressive than white :)