[hanhananh]

Hi everyone, so just like the title suggest, I currently own a 2011 535i x-Drive (non M-sport), which I believe to have the N55 engine if im not mistaken. Anyway, I am looking to get the most bang for the buck out of a ECU tune. So here are my few question:

1. How much HP will I be expecting to get out of a simple ECU tune?
2. Which Brand do you recommend?
3. How will the ECU tune effect my fuel economy? highway and in the city.

Thank you in advance for taking the time for helping me out.