Video - Birds M135i Complete Conversion vs BMW M2 - Autocar Magazine

Autocar and Birds have collaborated over the past 6 months on a project car, a BMW F21 M135i, by upgrading many different aspects of the model which are all included in the Birds B1 Complete Conversion package.

The contents of the Birds B1 Complete Conversion:

  • The Quaife ATB limited slip differential
  • Birds own B-Series Sport Suspension kit
  • Engine management software upgrade (390ps at 5700rpm and 520Nm at 3,200rpm)
  • Short gearshift
  • Clutch pedal weight modification

Dan Prosser, from Autocar, provides in-depth analysis of all of the listed upgrades and compares them to BMW's own F87 M2 here: