German tuner Alpina has recently revealed that it will be fully integrated into BMW by 2025. As a farewell gesture, Alpina is introducing the limited-edition Alpina B5 GT, which will be available for sale in Europe and Asia but unfortunately not in the U.S. This model marks the final version of Alpina’s 5-series lineup. It’s important to note that Alpina’s relationship with BMW goes beyond that of a typical tuner. Although Alpina is a separate company registered as an independent automaker in Germany, it has collaborated closely with BMW on…