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Birds BMW have invested in over 100 brand new rear axle differentials straight from BMW’s warehouse, which are now all available on their newly opened eBay shop. You will find...

Kevin,

Just a quick note to say that I’m very happy with the mods you made to my 440 today.  The gear change has improved immeasurably - shifts are shorter and the feel is much more mechanical.  I adapted to the heavier...

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.

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"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...