F20 / F21 1 Series (2012 - Current)
Hi Guys,
I won an M140i, and live in a hot country (Israel).
A lot of people here use the JB4, and I heard of at least 6 people braking engines (some N54, N55, B58).
There aren't many tuners here, and frankly I don't really trust them.
What are your experiences with tuning this engine?
(Did i...