"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.
"Our M135i out-punches the M2 by 25bhp and 51lb ft of torque, so it feels stronger through the mid-range and more urgent near the redline. But with less power to deploy to the road, and wider tyres with which to do it, the M2 does have...
