You have a N54 engine. This is important for you to know!
There are so many options to increase the power of your engine. Just check the N54 section on this Forum!
Whatever your tune will be using just remember that you will loose your warrenty. And by increasing the hp you will put more Stress on your engine and drivetrain. Keep this in mind!
I wish you good luck!
BEFORE: 130i N52 (2006-2011)
NOW: 335xi N55 (2011- )