JB+ N55 M135 M235 M2

There are many tunes available for the BMW N55. The most advanced and well proven N55 tuning box is the JB4. BMS has also developed a more simple N55 tuning box called the JB+ for those who want something more affordable and fit and forget. 

The N55 M135 M235 M2 JB+ increases boost by +4psi, which in turn raises power to approx 380 bhp. The N55 JB+ installs in minutes and gives you incredible performance normally seen on super cars 10 years ago.