"The Quaife diff sits alongside the suspension as a must have for anyone thinking about modifying an M235i or M240i. Not merely because it allows big silly skids, but because it works with the chassis to better deploy the engine's ample...
"After a lot of research, it came down to two companies, AC Schnitzer and Birds. Both companies' offering was of a similar price but I opted for Birds and for two reasons. Firstly, the Birds set-up only drops drive height by 5mm, so...
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.
