33 Differentials

Please note that the Exchange Differential option is now unavailable. We now only offer the QUAIFE LSD Conversion Kits for the existing differential.

"Berkshire-based BMW fettler sprinkles fairy dust on fast but flawed hatchback!"

Autocar review of Birds M140i B1 Conversion: https://www.autocar.co.uk/car-review/bmw/1-series/first-drives/birds-bmw-1-series-m140i-2020-uk-review

The review concentrates on our B1 Dynamics Package, which includes our B1 Sport Suspension and Quaife ATB Differential upgrades.

Date: 08/07/20

Hi Kevin,

I tested the car last couple of days and I am highly impressed with everything. The power, is amazing and more importantly it feels really safe to use. The traction is phenomenal. When out on a test drive yesterday, I had no choice but to drive over a pot hole in the road and it seemed to gobble it up! Whereas before in a similar car it would crash in and out of similar holes in the road if unavoidable.

For customers with highly modified cars, or who use their cars aggressively, or for those with high mileage cars looking to prolong the life of their differentials, we would recommend our high-performance bearings.

These uprated tapered bearings offer a 44% increase in load capacity compared to the standard BMW ball bearings, providing much improved durability and a longer lifespan.

The popular QUAIFE Automatic Torque-Biasing LSD is now available and in stock for many of the new BMW G20 3 series models, exclusively at Birds.

Once installed, drivers will notice an immediate difference as the Quaife ATB automatically biases torque across the axle to the wheel with most grip. Unwanted wheel-slip is greatly reduced, enabling drivers to exploit the full potential of their BMW for the first time.

Read the full review by EVO by clicking on the pictures below or by following this link: https://www.evo.co.uk/bmw/m140i/202709/birds-bmw-m140i-review-british-tuner-tweaks-bmws-rear-drive-hot-hatch

Date: 11/03/2020

After scouring the internet in the pursuit of finding a remedy for the terrible standard suspension set up, and sifting through the large amounts of false promises and looks based ‘performance upgrades’, I decided to give Kevin and James a call.

Date : 25/2/2020

Date: 31/1/2020

Hi James

Just a quick note to say I got the 135 back today. Delighted with it. The manual is on another level, I really like the short shift actually. With the DGS and there being 8 ratios it was always just a little aloof, I always felt I was a gear too high or a gear too low right when it mattered. It’s all the old cliches but a manual really does make all the difference, you get to really drive the car now and appreciate the other upgrades much more as a package.

There's something odd going on at BMW.