• Alpina has introduced more powerful GT variants of its B3 and B4 models
  • Output from the twin-turbo inline-6 has been cranked up to 522 hp
  • Unfortunately, the Alpina B3 GT and B4 GT models are forbidden fruit in the U.S. 

Alpina's range of tuned BMWs offers serious performance but without the brash, in-your-face styling that comes with vehicles from BMW's own M hot house.

For the 3-Series and 4-Series, Alpina offers the respective B3 and B4 models featuring the same twin-turbocharged 3.0-liter inline-6 found in BMW's own M3 and M4. In the Alpinas, the engine is tuned to deliver 488 hp.

Alpina has now introduced hotter GT versions of the B3 and B4, with output from the inline-6 dialed up to 522 hp. The extra power was extracted by recalibrating the engine mapping.

The 8-speed automatic in the B3 GT and B4 GT is also recalibrated to handle the extra performance from the engine, Alpina said. Drive goes to all four wheels as standard.

The B3 GT is offered as either a sedan or Touring wagon, while the B4 GT is available exclusively as a Gran Coupe hatchback. Alpina quotes a 0-62 mph time of 3.4 seconds for the B3 GT and 3.5 seconds for the B3 GT Touring and B4 GT Gran Coupe. The top speed is 191 mph.

Typical Alpina upgrades adorn the exteriors. These include a front lip spoiler, as well as a rear fascia element that covers up the expanse of black plastic on the standard BMW models. Alpina's signature quad-exhaust tip design and wheel patterns are also present. The wheels on the B3 GT and B4 GT measure 20 inches in diameter. Various Alpina logos dot the interior, including in the digital screens of the gauge cluster and infotainment system, and the cars get custom badging.

The B3 GT and B4 GT are based on updated versions of the 3-Series and 4-Series being introduced for the 2025 model year in the U.S. The updates to the regular BMW models include the addition of a 48-volt mild-hybrid system on the non-M models, as well as some minor chassis tweaks and some new trim options in the cabin.

The B3 and B4 aren't currently sold in the U.S., and that will likely continue for the new GT versions as well.