Alpina has launched hardcore GT versions of the B3, B3 Touring and B4 Gran Coupé before BMW takes full ownership of the Buchloe firm next year.

Touting higher performance, aero-optimised design tweaks and chassis changes, the new GT models are due on sale in Germany from November, with a UK launch expected to follow in early 2025. 

The new GTs use the same twin-turbocharged 3.0-litre straight-six petrol engine as the standard B3 and B4 but with a 33bhp power boost to a 522bhp peak, which is delivered higher in the rev range – between 6250rpm and 6500rpm.

Torque remains the same, at 538lb ft, sent through all four wheels through a ZF eight-speed automatic gearbox. 

Each car’s 0-62mph time has been cut by 0.2sec in line with the power increase, with the fastest – the B3 GT saloon – dispatching 0-62mph in 3.4sec. It has a top speed of 191mph – 2mph faster than before.

The GTs have also received chassis tweaks to improve handling and reduce roll, including a stiffer damper mounts, a reinforced bulkhead for more precise steering and a thicker rear anti-roll bar.

Spring rates have also been recalibrated for better ride comfort.

The B4 GT coupé specifically receives additional reinforcement for the anti-roll bars, as well as recalibration for the steering, dampers, four-wheel drive system and limited-slip differential.