Alpina will expand its portfolio of uprated BMW models with a new-generation B4, but while the previous car was based on the two-door 4 Series Coupé, it seems its successor will take the new 4 Series Gran Coupé as its basis.

New spy shots show an obviously uprated 4 Series Gran Coupé being tested on public roads, lending credence to earlier claims that Buchloe’s next unveiling will be a four-door proposition, rather than based on the two-door 4 Series coupé. The tip came from an unidentified source on the popular Bimmerpost forum who claimed to have access to future product plans “compiled from various leaks within the BMW organization”.

According to the dates outlined, the new Alpina B4 will be introduced in March 2022, as BMW ushers in a new four-wheel-drive 430ix variant of the G26-generation 4 Series Gran Coupé. It remains possible that a two-door version could follow shortly after.

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