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100 Brand New BMW differentials for various E30, E32, E36 and E38 models now available!

Get them before they're gone!

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...
Testimonial - Quaife LSD - F32 440i - Mr Smith

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...
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.

...
Testimonial - B1 Dynamics Package - E82 135i - Mr Field

Kevin

Extremely wet track day a Croft on Monday car performed faultlessly

Hopefully there is an image attached

Many thanks to you and your staff
...
Editorial - F20 M135i - Birds B1 review and M2 comparison - Autocar - March 2018

"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...
Editorial - F20 M135i - Birds B1 development complete, upcoming M2 comparison - Autocar Magazine - February 2018
Testimonial - Quaife LSD - Mercedes 215 CL65 AMG - Mr Frydenbo-Bruvoll

Date: 26/02/2018

Hi,
Testimonial - B1 Complete Conversion - E82 135i - Mr Field

Kevin

Just a quick note to thank you and your staff for the work done on the car, it does indeed feel a different vehicle, the crashing about over bumps and jumping around has disappeared, the...
Testimonial - Quaife LSD - E82 135i - Mr Tibble

Hi Kevin

Thanks very much. Back now and so will look at my calendar/funds and have a think.

On a side note, had more of a chance to get the best out of the differential recently. Only now...
Editorial - F20 M135i long-term review before and after Birds B1 upgrades - Autocar Online - January 2018

"Working with BMW tuners Birds, we’re going to replace the standard, under-specified suspension with much higher-quality Bilstein components tuned specifically for the M135i, we’re going to fit a Quaife limited-slip differential...

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