It’s not a full M car. But the BMW 135i (E82) has become a cult favorite among Ring drivers—for good reason. Perfect chassis balance. Reliable turbo punch. And a footprint that feels made for this ...

Aftermarket tuners have been quick to jump on the 1 Series, particularly the 135i with its twin-turbo N54 ... decided he’d test an innovative new ECU flashing tool from a company called Amberg ...