Alpina decided to stop making a model based on the 7-series after the introduction of the E23 745i . However, Alpina did offer a turbo upgrade package that allowed higher levels of boost. In the U.K, where the 745i wasn’t available, there was a market for a more powerful 7-series car so Alpina’s U.K authorized dealer Sytner was responsible for the Alpina 735i B10. Even though the 735i B10 was built in Great Britain it was a real hand-built Alpina with 261 hp, 3.5 liter, 6 cylinder engines that were delivered fully built from Germany to Sytner.
All of the B10s the had manual gearboxes. The rest of the car was also pure Alpina including special gas-filled Bilstein shock absorbers and progressive rate springs, 16 inch Alpina alloy wheels, Alpina front and rear spoilers and all of the other smaller bits and pieces that distinguish Alpina´s cars. Superior to the 745i, the B10 accelerated from 0-100 km/h (62 mph) in just about 7 seconds and it had a top speed of nearly 235 km/h (146 mph). In total, only 22 units were produced.