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.
The contents of the Birds B1 Complete Conversion:
"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 better traction..."
Read Autocar Magazine's review of our B1 M135i upgrades and comparison to BMW's M2 here!
"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 and we’re going to lift power to somewhere approaching 400bhp. We might yet make a few other modifications, too..."
As another exciting year at Birds comes to a close, we take a look back at some of our most notable achievements, new product developments, and what's in store for what's sure to be an interesting 2018...
Devising a demonstration
"with the LSD fitted, the M135i is wonderfully controllable, the rear end breaking away in a completely fluid and controllable way. It's brilliant..."
Read Autocar's full review of the Birds M135i, equipped with the famous Quaife ATB limited-slip differential.
Birds are pleased to announce the release of their Bilstein-based B-Series Sport Suspension upgrade for the F20 M135i and M140i.
The Birds B-Series Sport Suspension Kits consist of specially valved Bilstein shock absorbers and bespoke springs, designed by Birds and industry experts to offer the ultimate improvement in BMW ride quality and handling on the UK's diverse road surfaces.
